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BEGIN:VEVENT
SUMMARY:Nicholas Wilkins (Bristol)
DTSTART;VALUE=DATE-TIME:20200417T131500Z
DTEND;VALUE=DATE-TIME:20200417T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/1
DESCRIPTION:Title: Equivariant quantum operations and relations between them\nby Nic
holas Wilkins (Bristol) as part of Symplectic zoominar\n\n\nAbstract\nTher
e is growing interest in looking at operations on quantum cohomology that
take into account symmetries in the holomorphic spheres (such as the quant
um Steenrod powers\, using a Z/p-symmetry). In order to prove relations be
tween them\, one needs to generalise this to include equivariant operation
s with more marked points\, varying domains and different symmetry groups.
We will look at the general method of construction of these operations\,
as well as two distinct examples of relations between them.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lisa Traynor (Bryn Mawr)
DTSTART;VALUE=DATE-TIME:20200424T131500Z
DTEND;VALUE=DATE-TIME:20200424T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/2
DESCRIPTION:Title: The geography of immersed Lagrangian fillings of Legendrian submanifo
lds\nby Lisa Traynor (Bryn Mawr) as part of Symplectic zoominar\n\n\nA
bstract\nGiven a smooth knot K in the 3-sphere\, a classic question in kno
t theory is: What surfaces in the 4-ball have boundary equal to K? One can
also consider immersed surfaces and ask a “geography” question: What
combinations of genus and double points can be realized by surfaces with b
oundary equal to K? I will discuss symplectic analogues of these question
s: Given a Legendrian knot\, what Lagrangian surfaces can it bound? What
immersed Lagrangian surfaces can it bound? These Lagrangian surfaces are
commonly called Lagrangian fillings of the Legendrian knot and are more ri
gid than their topological counterpart. In particular\, while any smooth
knot bounds an infinite number of topologically distinct surfaces\, there
are classical and non-classical obstructions to the existence of Lagrangia
n fillings of Legendrian knots. Specifically\, a polynomial associated to
the Legendrian boundary through the technique of generating families can
show that there is no compatible embedded Lagrangian filling. Immersed La
grangian fillings are more flexible\, and I will describe how this polynom
ial associated to the Legendrian boundary forbids particular combinations
of genus and double points in immersed Lagrangian fillings. In addition\,
I will describe some constructions of immersed fillings that allow us to
completely answer the Lagrangian geography question for some Legendrian kn
ots. This is joint work with Samantha Pezzimenti.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alberto Abbondandolo (Bochum)
DTSTART;VALUE=DATE-TIME:20200501T131500Z
DTEND;VALUE=DATE-TIME:20200501T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/3
DESCRIPTION:Title: Zoll contact forms are local maximisers of the systolic ratio\nby
Alberto Abbondandolo (Bochum) as part of Symplectic zoominar\n\n\nAbstrac
t\nA central question from systolic geometry is to find upper bounds for t
he systolic ratio of a Riemannian metric on a closed $n$-dimensional manif
old\, i.e. the ratio of the $n$-th power of the shortest length of closed
geodesics by the volume. This question can be naturally extended to Reeb f
lows\, a class of dynamical systems including geodesic flows and induced b
y a contact form on a closed manifold. The aim of this talk is to discuss
a recent result obtained in collaboration with Gabriele Benedetti: Zoll co
ntact forms\, i.e. forms such that all the orbits of the induced Reeb flow
are periodic with the same period\, are local maximisers of the systolic
ratio. Consequences of this result are: (i) sharp systolic inequalities fo
r Riemannian and Finsler metrics close to Zoll ones\, (ii) the perturbativ
e case of a conjecture of Viterbo on the symplectic capacity of convex bod
ies\, (iii) a generalization of Gromov's non-squeezing theorem in the inte
rmediate dimensions for symplectomorphisms that are close to linear ones.\
n
LOCATION:https://researchseminars.org/talk/SympZoominar/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Marco Mazzucchelli (ENS- Lyon)
DTSTART;VALUE=DATE-TIME:20200508T131500Z
DTEND;VALUE=DATE-TIME:20200508T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/4
DESCRIPTION:Title: Spectral characterizations of Besse and Zoll Reeb flows\nby Marco
Mazzucchelli (ENS- Lyon) as part of Symplectic zoominar\n\n\nAbstract\nIn
this talk\, I will address a geometric inverse problem from contact geome
try: is it possible to recognize whether all orbits of a given Reeb flow a
re closed from the knowledge of the action spectrum? Borrowing the termino
logy from Riemannian geometry\, Reeb flows all of whose orbits are closed
are sometimes called Besse\, and Besse Reeb flows all of whose orbits have
the same minimal period are sometimes called Zoll. In the talk I will su
mmarize recent results on this inverse problem in a few settings: geodesic
flows (joint work with Stefan Suhr)\, closed contact 3-manifolds (joint w
ork with Daniel Cristofaro-Gardiner)\, convex contact spheres and\, more g
enerally\, restricted contact type hypersurfaces of symplectic vector spac
es (joint work with Viktor Ginzburg and Basak Gürel). I will also mention
a few conjectures and open problems.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jo Nelson (Rice)
DTSTART;VALUE=DATE-TIME:20200515T131500Z
DTEND;VALUE=DATE-TIME:20200515T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/5
DESCRIPTION:Title: Reflections on cylindrical contact homology\nby Jo Nelson (Rice)
as part of Symplectic zoominar\n\n\nAbstract\nThis talk beings with a ligh
t introduction\, including some historical anecdotes to motivate the deve
lopment of this Floer theoretic machinery for contact manifolds some 25 ye
ars ago. I will discuss joint work with Hutchings which constructs noneq
uivariant and a family Floer equivariant version of contact homology. Both
theories are generated by two copies of each Reeb orbit over Z and captur
e interesting torsion information. I will explain the need for an obstruc
tion bundle gluing correction term in the expression of the differential i
n the presence of contractible Reeb orbits\, which is essential even in th
e simple example of an ellipsoid. I will then explain how one can recover
the original cylindrical theory proposed by Eliashberg-Givental-Hofer via
our constructions.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Denis Auroux (Harvard)
DTSTART;VALUE=DATE-TIME:20200522T131500Z
DTEND;VALUE=DATE-TIME:20200522T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/6
DESCRIPTION:Title: Mirrors of curves and their Fukaya categories\nby Denis Auroux (H
arvard) as part of Symplectic zoominar\n\n\nAbstract\nHomological mirror s
ymmetry predicts that the derived category of coherent sheaves on a curve
has a symplectic counterpart as the Fukaya category of a mirror space. How
ever\, with the exception of elliptic curves\, this mirror is usually a sy
mplectic Landau-Ginzburg model\, i.e. a non-compact manifold equipped with
the extra data of a "stop" in its boundary at infinity. Most of the talk
will focus on a family of Landau-Ginzburg models which provide mirrors to
curves in (C*)^2 or in toric surfaces (or more generally to hypersurfaces
in toric varieties)\, and their fiberwise wrapped Fukaya categories (joint
work with Mohammed Abouzaid). I will then discuss more a speculative way
of constructing mirrors of curves without Landau-Ginzburg models\, involvi
ng a new flavor of Lagrangian Floer theory in trivalent configurations of
Riemann surfaces (joint work with Alexander Efimov and Ludmil Katzarkov).\
n
LOCATION:https://researchseminars.org/talk/SympZoominar/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alex Oancea (Paris)
DTSTART;VALUE=DATE-TIME:20200529T131500Z
DTEND;VALUE=DATE-TIME:20200529T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/7
DESCRIPTION:Title: Duality for Rabinowitz-Floer homology\nby Alex Oancea (Paris) as
part of Symplectic zoominar\n\n\nAbstract\nI will explain a duality theore
m with products in Rabinowitz-Floer homology. This has a bearing on string
topology and explains a number of dualities that have been observed in th
at setting. Joint work in progress with Kai Cieliebak and Nancy Hingston.\
n
LOCATION:https://researchseminars.org/talk/SympZoominar/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Leonid Polterovich (Tel Aviv)
DTSTART;VALUE=DATE-TIME:20200410T131500Z
DTEND;VALUE=DATE-TIME:20200410T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/8
DESCRIPTION:Title: Geometry of Quantum Uncertainty\nby Leonid Polterovich (Tel Aviv)
as part of Symplectic zoominar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/SympZoominar/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Daniel Cristofaro-Gardiner (IAS)
DTSTART;VALUE=DATE-TIME:20200403T131500Z
DTEND;VALUE=DATE-TIME:20200403T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/9
DESCRIPTION:Title: The Simplicity Conjecture\nby Daniel Cristofaro-Gardiner (IAS) as
part of Symplectic zoominar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/SympZoominar/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Octav Cornea (Montreal)
DTSTART;VALUE=DATE-TIME:20200327T131500Z
DTEND;VALUE=DATE-TIME:20200327T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/10
DESCRIPTION:Title: Fragmentation pseudo-metrics and Lagrangian submanifolds\nby Oct
av Cornea (Montreal) as part of Symplectic zoominar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/SympZoominar/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mark Mclean (SUNY\, Stony Brook)
DTSTART;VALUE=DATE-TIME:20200612T131500Z
DTEND;VALUE=DATE-TIME:20200612T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/11
DESCRIPTION:Title: Floer Cohomology and Arc Spaces.\nby Mark Mclean (SUNY\, Stony B
rook) as part of Symplectic zoominar\n\n\nAbstract\nLet f be a polynomial
over the complex numbers with an isolated singular point at the origin and
let d be a positive integer. To such a polynomial we can assign a variety
called the dth contact locus of f. Morally\, this corresponds to the spac
e of d-jets of holomorphic disks in complex affine space whose boundary `w
raps' around the singularity d times. We show that Floer cohomology of the
dth power of the Milnor monodromy map is isomorphic to compactly supporte
d cohomology of the dth contact locus. This answers a question of Paul Sei
del and it also proves a conjecture of Nero Budur\, Javier Fernández de B
obadilla\, Quy Thuong Lê and Hong Duc Nguyen. The key idea of the proof i
s to use a jet space version of the PSS map together with a filtration arg
ument.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Morgan Weiler\, Joé Brendel\, Abror Pirnapasov
DTSTART;VALUE=DATE-TIME:20200605T131500Z
DTEND;VALUE=DATE-TIME:20200605T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/12
DESCRIPTION:Title: Three 20 minutes research talks by young researchers.\nby Morgan
Weiler\, Joé Brendel\, Abror Pirnapasov as part of Symplectic zoominar\n
\n\nAbstract\nMorgan Weiler (Rice):Infinite staircases of symplectic embed
dings of ellipsoids into Hirzebruch surfaces\n\n \nJoé Brendel (Neuchatel
): Real Lagrangian Tori in toric symplectic manifolds \n\nAbror Pirnapasov
(Bochum): Reeb orbits that force topological entropy\n\nSee the external
web page for full abstracts.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Igor Uljarevic (Belgrade)
DTSTART;VALUE=DATE-TIME:20200619T131500Z
DTEND;VALUE=DATE-TIME:20200619T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/13
DESCRIPTION:Title: Exotic symplectomorphisms and contact circle action\nby Igor Ulj
arevic (Belgrade) as part of Symplectic zoominar\n\n\nAbstract\nAn exotic
symplectomorphism is a symplectomorphism that is not isotopic to the ident
ity through compactly supported symplectomorphisms.Using Floer-theoretic m
ethods\, we prove that the non-existence of an exotic symplectomorphism on
the standard symplectic ball\, $\\mathbb{B}^{2n}\,$ implies a rather stri
ct topological condition on the free contact circle actions on the standar
d contact sphere\, $\\mathbb{S}^{2n-1}.$ We also prove an analogue for a L
iouville domain and contact circle actions on its boundary. Applications i
nclude results on the symplectic mapping class group\, the fundamental gro
up of the group of contactomorphisms\, and exotic contact structures on $\
\mathbb{S}^3.$ The talk is based on joint work with Dusan Drobnjak.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/13/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ailsa Keating (Cambridge)
DTSTART;VALUE=DATE-TIME:20200626T131500Z
DTEND;VALUE=DATE-TIME:20200626T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/14
DESCRIPTION:Title: Distinguishing monotone Lagrangians via holomorphic annuli\nby A
ilsa Keating (Cambridge) as part of Symplectic zoominar\n\n\nAbstract\nWe
present techniques for constructing families of compact\, monotone (includ
ing exact) Lagrangians in certain affine varieties\, starting with Briesko
rn-Pham hypersurfaces. We will focus on dimensions 2 and 3. In particular\
, we'll explain how to set up well-defined counts of holomorphic annuli fo
r a range of these families. Time allowing\, we will give a number of appl
ications.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/14/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ana Rita Pires (Edinburgh)
DTSTART;VALUE=DATE-TIME:20200703T131500Z
DTEND;VALUE=DATE-TIME:20200703T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/15
DESCRIPTION:Title: Infinite staircases and reflexive polygons (part of Ellipsoid day jo
int with Western Hemisphere Virtual Symplectic Seminar)\nby Ana Rita P
ires (Edinburgh) as part of Symplectic zoominar\n\n\nAbstract\nA classic r
esult\, due to McDuff and Schlenk\, asserts that the function that encodes
when a four-dimensional symplectic ellipsoid can be embedded into a four-
dimensional ball has a remarkable structure: the function has infinitely m
any corners\, determined by the odd-index Fibonacci numbers\, that fit tog
ether to form an infinite staircase. The work of McDuff and Schlenk has re
cently led to considerable interest in understanding when the ellipsoid em
bedding function for other symplectic 4-manifolds is partly described by a
n infinite staircase. In this talk we will discuss a general framework fo
r analyzing this question for a large family of targets\, and in particula
r give an obstruction to the existence of an infinite staircase that exper
imentally seems strong. We will then look at the special case of rational
convex toric domains / closed symplectic toric manifolds\, for which we pr
ove the existence of six families of targets with infinite staircases that
are distinguished by the fact that their moment polygon is reflexive. The
proof uses\, among other tools\, almost toric fibrations -- see also the
second of the ellipsoid day talks. Finally\, we conjecture that these six
families constitute a complete answer to the question of existence of infi
nite staircase. This conjecture has been verified in the case when the tar
get is an ellipsoid -- see the third of the ellipsoid day talks. This is b
ased on joint work of Dan Cristofaro-Gardiner\, Tara Holm\, Alessia Mandin
i\, and Ana Rita Pires.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/15/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Peter Ozsvath (Princeton)
DTSTART;VALUE=DATE-TIME:20200710T131500Z
DTEND;VALUE=DATE-TIME:20200710T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/16
DESCRIPTION:Title: Knot Floer homology and bordered algebras\nby Peter Ozsvath (Pri
nceton) as part of Symplectic zoominar\n\n\nAbstract\nKnot Floer homology
is an invariant for knots in three-space\, defined as a Lagrangian Floer h
omology in a symmetric product. It has the form of a bigraded vector spac
e\, encoding topological information about the knot. I will discuss an al
gebraic approach to computing knot Floer homology\, and a corresponding ve
rsion for links\, based on decomposing knot diagrams. This is joint work w
ith Zoltan Szabo\, building on earlier joint work (bordered Heegaard Floer
homology) with Robert Lipshitz and Dylan Thurston.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/16/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yusuke Kawamoto (Ecole Normale Supérieure)\, Shira Tanny (Tel-Avi
v University)\, and Javier Martínez-Aguinaga (Universidad Complutense Mad
rid)
DTSTART;VALUE=DATE-TIME:20200717T131500Z
DTEND;VALUE=DATE-TIME:20200717T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/17
DESCRIPTION:Title: Three 20 minutes research talks by young researchers.\nby Yusuke
Kawamoto (Ecole Normale Supérieure)\, Shira Tanny (Tel-Aviv University)\
, and Javier Martínez-Aguinaga (Universidad Complutense Madrid) as part o
f Symplectic zoominar\n\n\nAbstract\nKawamoto: Homogeneous quasimorphism\,
C^0-topology and Lagrangian intersection\n\nTanny: Floer theory of disjoi
ntly supported Hamiltonians\n\nMartínez-Aguinaga: Madrid Formal Legendria
n and horizontal embeddings\n
LOCATION:https://researchseminars.org/talk/SympZoominar/17/
END:VEVENT
BEGIN:VEVENT
SUMMARY:John Pardon (Princeton)
DTSTART;VALUE=DATE-TIME:20200724T131500Z
DTEND;VALUE=DATE-TIME:20200724T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/18
DESCRIPTION:Title: Pontryagin--Thom for orbifold bordism\nby John Pardon (Princeton
) as part of Symplectic zoominar\n\n\nAbstract\nThe classical Pontryagin
–Thom isomorphism equates manifold bordism groups with corresponding sta
ble homotopy groups. This construction moreover generalizes to the equiva
riant context. I will discuss work which establishes a Pontryagin--Thom i
somorphism for orbispaces (an orbispace is a "space" which is locally mode
lled on Y/G for Y a space and G a finite group\; examples of orbispaces in
clude orbifolds and moduli spaces of pseudo-holomorphic curves). This inv
olves defining a category of orbispectra and an involution of this categor
y extending Spanier--Whitehead duality. Global homotopy theory also plays
a key role.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/18/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Georgios Dimitroglou Rizell (Uppsala)
DTSTART;VALUE=DATE-TIME:20200904T131500Z
DTEND;VALUE=DATE-TIME:20200904T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/19
DESCRIPTION:Title: Hamiltonian classification and unlinkedness of fibres in cotangent b
undles of Riemann surfaces\nby Georgios Dimitroglou Rizell (Uppsala) a
s part of Symplectic zoominar\n\n\nAbstract\nIn a joint work with Laurent
Côté we show the following\nresult. Any Lagrangian plane in the cotangen
t bundle of an open Riemann surface which coincides with a cotangent fibre
outside of some compact subset\, is compactly supported Hamiltonian isoto
pic to that fibre. This result implies Hamiltonian unlinkedness for Lagran
gian links in the cotangent bundle of a (possibly closed Riemann surface w
hose components are Hamiltonian isotopic to fibres.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/19/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Vincent Colin (Nantes)
DTSTART;VALUE=DATE-TIME:20200911T131500Z
DTEND;VALUE=DATE-TIME:20200911T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/20
DESCRIPTION:Title: Reeb dynamics in dimension 3 and broken book decompositions\nby
Vincent Colin (Nantes) as part of Symplectic zoominar\n\n\nAbstract\nIn a
joint work with Pierre Dehornoy and Ana Rechtman\, we prove that on a clos
ed 3-manifold\, every nondegenerate Reeb vector field is supported by a br
oken book decomposition. From this property\, we deduce that in dimension
3 every nondegenerate Reeb vector field has either 2 or infinitely periodi
c orbits and that on a closed 3-manifold that is not graphed\, every nonde
generate Reeb vector field has positive topological entropy.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/20/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cheol-Hyun Cho (Seoul)
DTSTART;VALUE=DATE-TIME:20200918T131500Z
DTEND;VALUE=DATE-TIME:20200918T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/21
DESCRIPTION:Title: Fukaya category for Landau-Ginzburg orbifolds and Berglund-H\\"ubsch
homological mirror symmetry for curve singularities.\nby Cheol-Hyun C
ho (Seoul) as part of Symplectic zoominar\n\n\nAbstract\nFor a weighted ho
mogeneous polynomial and a choice of a diagonal symmetry group\, we define
a new Fukaya category based on wrapped Fukaya category of its Milnor fibe
r together with monodromy\ninformation. It is analogous to the variation o
perator in singularity theory. As an application\, we formulate a complete
version of Berglund-H\\"ubsch homological mirror symmetry and prove it fo
r two variable cases. Namely\, given one of the polynomials $f= x^p+y^q\,
x^p+xy^q\,x^py+xy^q$ and a symmetry group $G$\, we use Floer theoretic con
struction to obtain the transpose polynomial $f^t$ with the transpose symm
etry group $G^t$ as well as an explicit A-infinity equivalence between the
new Fukaya category of $(f\,G)$ to the matrix factorization category of $
(f^t\, G^t)$. In this case\, monodromy is mirror to the restriction of LG
model to a hypersurface. For ADE singularities\, Auslander-Reiten quiver
for indecomposable matrix factorizations were known from 80's\, and we fin
d the corresponding Lagrangians as well as surgery exact sequences. This
is a joint work with Dongwook Choa and Wonbo Jung.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/21/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lev Buhovsky (Tel Aviv)
DTSTART;VALUE=DATE-TIME:20201009T131500Z
DTEND;VALUE=DATE-TIME:20201009T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/22
DESCRIPTION:Title: The Arnold conjecture\, spectral invariants and C^0 symplectic topol
ogy\nby Lev Buhovsky (Tel Aviv) as part of Symplectic zoominar\n\n\nAb
stract\nThe Arnold conjecture about fixed points of Hamiltonian diffeomorp
hisms was partly motivated by the celebrated Poincare-Birkhoff fixed point
\ntheorem for an area-preserving homeomorphism of an annulus in the plane
. Despite the fact that the Arnold conjecture was formulated in he smooth
setting\, several attempts to return to the continuous setting of homeomor
phisms and to study the conjecture in this setting has been made afterward
s. In this talk I will describe some old and more recent results on the su
bject. Based on a joint work with V. Humiliere and S. Seyfaddini.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/22/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jun Zhang (Montreal)
DTSTART;VALUE=DATE-TIME:20200925T131500Z
DTEND;VALUE=DATE-TIME:20200925T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/23
DESCRIPTION:Title: Triangulated persistence categories\nby Jun Zhang (Montreal) as
part of Symplectic zoominar\n\n\nAbstract\nThis talk will discuss a new al
gebraic structure called triangulated persistence category (TPC). It combi
nes the triangulated category structure with the persistence module struct
ure. This algebraic structure can be used to associate a metric topology o
n the object-set of a triangulated category\, which leads to various dynam
ical questions on a pure algebraic set-up. Many examples are naturally end
owed with the TPC structure\, for instance\, derived Fukaya category\, Tam
arkin category\, etc. In this talk\, we will illustrate one algebraic exam
ple in depth via extending the Bondal-Kapranov’s classical pre-triangula
ted dg-category to a filtered version. This talk is based on an in-progres
s project joint with Paul Biran and Octav Cornea.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/23/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dusa McDuff (Columbia)
DTSTART;VALUE=DATE-TIME:20201002T131500Z
DTEND;VALUE=DATE-TIME:20201002T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/24
DESCRIPTION:Title: Embedding ellipsoids into the one-point blowup of $\\C P^2$\nby
Dusa McDuff (Columbia) as part of Symplectic zoominar\n\n\nAbstract\nThis
talk reports on joint work with Maria Bertozzi\, Tara Holm\, Emily Maw\,
Grace Mwakyoma\, Ana Rita Pires\, and Morgan Weiler on a WiSCon project
to investigate the embedding capacity function of the one-point blow up
of $\\C P^2$. We found three new families of staircases\, that are relate
d by symmetries and have other interesting structural features. This talk
will explain our findings and our conjectures.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/24/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Michael Hutchings (Berkeley)
DTSTART;VALUE=DATE-TIME:20201023T131500Z
DTEND;VALUE=DATE-TIME:20201023T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/25
DESCRIPTION:Title: Examples related to Viterbo's conjectures\nby Michael Hutchings
(Berkeley) as part of Symplectic zoominar\n\n\nAbstract\nViterbo conjectur
ed that a normalized symplectic capacity\, on convex domains of a given vo
lume\, is maximized for the ball. A stronger version of this conjecture as
serts that all normalized symplectic capacities agree on convex domains. S
ince convexity is not symplectomorphism invariant\, one can also ask to wh
at extent these statements still hold for nonconvex domains. We survey som
e special cases and examples around these questions\, including recent joi
nt works with Julian Chaidez and Jean Gutt + Vinicius Ramos.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/25/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Umut Varolgunes (Stanford)
DTSTART;VALUE=DATE-TIME:20201016T131500Z
DTEND;VALUE=DATE-TIME:20201016T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/26
DESCRIPTION:Title: Mirror symmetry for chain type polynomials\nby Umut Varolgunes (
Stanford) as part of Symplectic zoominar\n\n\nAbstract\nI will start by ex
plaining Takahashi's homological mirror symmetry (HMS) conjecture regardin
g invertible polynomials\, which is an open string reinterpretation of Ber
glund-Hubsch-Henningson mirror symmetry. In joint work with A. Polishchuk\
, we resolved this HMS conjecture in the chain type case up to rigorous pr
oofs of general statements about Fukaya-Seidel categories. Our proof goes
by showing that the categories in both sides are obtained from the categor
y Vect(k) by applying a recursion. I will explain this recursion categoric
ally and sketch the argument for why it is satisfied on the A-side assumin
g the aforementioned foundational results. If time permits\, I will also m
ention what goes into the proof in the B-side.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/26/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Eva Miranda (UPC)
DTSTART;VALUE=DATE-TIME:20201204T141500Z
DTEND;VALUE=DATE-TIME:20201204T154500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/27
DESCRIPTION:Title: The singular Weinstein conjecture and the Contact/Beltrami mirror\nby Eva Miranda (UPC) as part of Symplectic zoominar\n\n\nAbstract\nIn t
his talk\, I will address the (singular) Weinstein conjecture about the ex
istence of (singular) periodic orbits of Reeb vector fields on compact man
ifolds endowed with singular contact forms. Our motivating examples come f
rom Celestial mechanics (restricted three-body problem) where contact topo
logy techniques were already successful in determining the existence of pe
riodic orbits (Albers-Frauenfelder-Van Koert-Paternain). With the aim of c
ompleting this understanding\, we deal with the restricted three body exam
ple by adding the so-called "infinity set" (via a McGehee regularization).
This induces a singularity on the contact structure which permeates the g
eometry and topology of the problem.\n\nHofer's fine techniques to prove t
he Weinstein conjecture for overtwisted 3-dimensional contact manifolds ca
n be adapted in this singular set-up under some symmetry assumptions close
to the singular set (which also work for the non-compact case). We prove
the existence of infinite smooth Reeb periodic orbits on the (compact) cri
tical set of the contact form. This critical set can often be identified w
ith the collision set or set at infinity in the motivating examples from C
elestial mechanics. In those examples\, escape trajectories can be often c
ompactified as singular periodic orbits.\n \nTime permitting\, we will end
up this talk proving the existence of escape orbits and generalized singu
lar periodic orbits for 3-dimensional singular contact manifolds under som
e mild assumptions. Our theory benefits in a great manner from the existen
ce of a correspondence (up to reparametrization) between Reeb and Beltrami
vector fields (Etnyre and Ghrist) which can be exported to this singular
set-up. In particular\, Uhlenbeck's genericity results for the eigenfuncti
ons of the Laplacian is a key point of the proof.\n\nThe contents of this
talk are based on joint works with Cédric Oms and Daniel Peralta-Salas.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/27/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Zhengyi Zhou (IAS\, Princeton)
DTSTART;VALUE=DATE-TIME:20201211T141500Z
DTEND;VALUE=DATE-TIME:20201211T154500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/28
DESCRIPTION:Title: Hierarchies of contact manifolds via rational SFT\nby Zhengyi Zh
ou (IAS\, Princeton) as part of Symplectic zoominar\n\n\nAbstract\nI will
explain the construction of a functor from the exact symplectic cobordism
category to a totally ordered set\, which measures the complexity of the c
ontact structure. Those invariants are derived from a bi-Lie infinity for
malism of the rational SFT and a partial construction of the rational SFT.
In this talk\, I will focus on the construction and properties of the fun
ctor. Time permitting\, I will explain applications\, computations\, and r
elations to the involutive bi-Lie infinity formalism of the full SFT. This
is joint work with Agustin Moreno.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/28/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kai Cieliebak (Augsburg)
DTSTART;VALUE=DATE-TIME:20201106T141500Z
DTEND;VALUE=DATE-TIME:20201106T154500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/29
DESCRIPTION:Title: Secondary coproducts in Morse and Floer homology\nby Kai Cielieb
ak (Augsburg) as part of Symplectic zoominar\n\n\nAbstract\nThis talk is a
bout joint work with Nancy Hingston and Alexandru Oancea. We describe vari
ous secondary coproducts on the Floer homology of a cotangent bundle and s
how that\, under Viterbo's isomorphism\, they all correspond to the Goresk
y-Hingston coproduct on loop space homology. The proof uses compactified m
oduli spaces of punctured holomorphic annuli.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/29/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yu-Wei Fan (Berkeley)\; Surena Hozoori (Georgia Tech)\; Marcelo A
tallah (Montreal)
DTSTART;VALUE=DATE-TIME:20201127T141500Z
DTEND;VALUE=DATE-TIME:20201127T154500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/30
DESCRIPTION:Title: Three short research talks of 20 min each.\nby Yu-Wei Fan (Berke
ley)\; Surena Hozoori (Georgia Tech)\; Marcelo Atallah (Montreal) as part
of Symplectic zoominar\n\n\nAbstract\nYu-Wei Fan: Shifting numbers in tri
angulated categories.\n\nAbstract: One can consider endofunctors of triang
ulated categories as categorical dynamical systems\, and study their long
term behaviors under large iterations. There are (at least) three natural
invariants that one can associate to endofunctors from the dynamical persp
ective: categorical entropy\, and upper/lower shifting numbers. We will re
call some background on categorical dynamical systems and categorical entr
opy\, and introduce the notion of shifting numbers\, which measure the asy
mptotic amount by which an endofunctor of a triangulated category translat
es inside the category. The shifting numbers are analogous to Poincare tra
nslation numbers. We additionally establish that in some examples the shif
ting numbers provide a quasimorphism on the group of autoequivalences. Joi
nt work with Simion Filip.\n\nSurena Hozoori: Symplectic Geometry of Anoso
v Flows in Dimension 3 and Bi-Contact Topology.\n\nAbstract: We give a pur
ely contact and symplectic geometric characterization of Anosov flows in d
imension 3 and set up a framework to use tools from contact and symplectic
geometry and topology in the study of questions about Anosov dynamics. If
time permits\, we will discuss some uniqueness results for the underlying
(bi-) contact structure for an Anosov flow\, and/or a characterization of
Anosovity based on Reeb flows.\n\nMarcelo Atallah: Hamiltonian no-torsion
\n\nAbstract: In 2002 Polterovich notably showed that Hamiltonian diffeomo
rphisms of finite order\, which we call Hamiltonian torsion\, must be triv
ial on closed symplectically aspherical manifolds. We study the existence
of Hamiltonian torsion and its metric rigidity properties in more general
situations. First\, we extend Polterovich's result to closed symplecticall
y Calabi-Yau and closed negative monotone manifolds. Second\, going beyond
topological constraints\, we describe how Hamiltonian torsion is related
to the existence of pseudo-holomorphic spheres and answer a close variant
of Problem 24 from the introductory monograph of McDuff-Salamon. Finally\,
we prove an analogue of Newman’s 1931 theorem for Hofer’s metric and
Viterbo’s spectral metric on the Hamiltonian group of monotone symplecit
c manifolds: a sufficiently small ball around the identity contains no tor
sion. During the talk\, I shall discuss the results above and some of the
key ingredients of their proofs. This talk is based on joint work with Ego
r Shelukhin.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/30/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Simon Allais (ENS Lyon)\; Orsola Capovilla-Searle (Duke)\; Julia
n Chaidez (UCB)
DTSTART;VALUE=DATE-TIME:20201030T131500Z
DTEND;VALUE=DATE-TIME:20201030T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/31
DESCRIPTION:Title: Three short research talks of 20 min each.\nby Simon Allais (ENS
Lyon)\; Orsola Capovilla-Searle (Duke)\; Julian Chaidez (UCB) as part o
f Symplectic zoominar\n\n\nAbstract\nSimon Allais (ENS Lyon): Generating f
unctions in Hamiltonian dynamics and symplectic-contact rigidity\n\nAbstra
ct: Generating functions of Hamiltonian diffeomorphisms are maps that can
be seen as finite dimensional versions of the action functional. In variou
s situations\, classical Morse theory applied to them can retrieve the sam
e information as the Floer theory. In this talk\, I will introduce this to
ol and expose some old and new results of Hamiltonian dynamics and symplec
tic rigidity that can be retrieved and sometimes extended using elementary
Morse theory and generating functions\; among others\, the recent theorem
of Shelukhin about the Hofer-Zehnder conjecture in the special case of CP
^d and a contact generalization of the symplectic camel theorem.\n\nOrsola
Capovilla-Searle (Duke University): Weinstein handle decompositions of co
mplements of toric divisors in toric 4 manifolds\n\nAbstract: We consider
toric 4 manifolds with certain toric divisors that have normal crossing si
ngularities. The normal crossing singularities can be smoothed\, changing
the topology of the complement. In specific cases this complement has a We
instein structure\, and we develop an algorithm to construct a Weinstein h
andlebody diagram of the complement of the smoothed toric divisor. The alg
orithm we construct more generally gives a Weinstein handlebody diagram fo
r Weinstein 4-manifolds constructed by attaching 2 handles to T*S for any
surface S\, where the 2 handles are attached along the conormal lift of cu
rves on S. Joint work with Bahar Acu\, Agnes Gadbled\, Aleksandra Marinko
vic\, Emmy Murphy\, Laura Starkston and Angela Wu.\n\nJulian Chaidez (UC B
erkeley): ECH Embedding Obstructions For Rational Surfaces\n\nAbstract: I
s the Gromov width on toric varieties monotonic with respect to inclusions
of moment polytopes? In this talk\, I will prove a generalization in dime
nsion 4: the "width" associated to a concave toric domain is monotonic wit
h inclusion of momenty polygons. This is an application of some new algebr
o-geometric obstructions for embeddings of star-shaped domains into ration
al surfaces. This work is joint with Ben Wormleighton.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/31/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nick Sheridan (Edinburgh)
DTSTART;VALUE=DATE-TIME:20201113T141500Z
DTEND;VALUE=DATE-TIME:20201113T154500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/32
DESCRIPTION:Title: Quantum cohomology as a deformation of symplectic cohomology\nby
Nick Sheridan (Edinburgh) as part of Symplectic zoominar\n\n\nAbstract\nL
et X be a compact symplectic manifold\, and D a normal crossings symplecti
c divisor in X. We give a criterion under which the quantum cohomology of
X is the cohomology of a natural deformation of the symplectic cochain com
plex of X \\ D. The criterion can be thought of in terms of the Kodaira di
mension of X (which should be non-positive)\, and the log Kodaira dimensio
n of X \\ D (which should be non-negative). The crucial tool is Varolgunes
' relative symplectic cohomology. This is joint work with Strom Borman and
Umut Varolgunes.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/32/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Paul Biran (ETH Zurich)
DTSTART;VALUE=DATE-TIME:20201120T141500Z
DTEND;VALUE=DATE-TIME:20201120T154500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/33
DESCRIPTION:Title: Persistence and Triangulation in Lagrangian Topology.\nby Paul B
iran (ETH Zurich) as part of Symplectic zoominar\n\n\nAbstract\nTriangulat
ed categories play an important role in symplectic topology. The aim of th
is talk is to explain how to combine triangulated structures with persiste
nce module theory in a geometrically meaningful way. The guiding principle
comes from the theory of Lagrangian cobordism. The talk is based on ongoi
ng joint work with Octav Cornea and Jun Zhang.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/33/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lisa Jeffrey (University of Toronto)
DTSTART;VALUE=DATE-TIME:20210115T141500Z
DTEND;VALUE=DATE-TIME:20210115T154500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/34
DESCRIPTION:Title: Symplectic implosion\nby Lisa Jeffrey (University of Toronto) as
part of Symplectic zoominar\n\n\nAbstract\nSymplectic implosion was devel
oped to solve the problem that the\nsymplectic cross-section of a Hamilton
ian K-space is usually not\nsymplectic\, when K is a compact Lie group.\n\
nThe symplectic implosion is a stratified symplectic space\, introduced in
\na 2002 paper of the speaker with Guillemin and Sjamaar. I survey some e
xamples showing how symplectic implosion has been used.\nI describe the un
iversal imploded cross-section\, which is the\nimploded cross-section of t
he cotangent bundle of a compact Lie group.\n\nImploded cross-sections are
normally not smooth manifolds.\nWe describe some invariants (for example
intersection homology)\nwhich replace homology for singular stratified sp
aces.\n\n(Joint work with Sina Zabanfahm)\n
LOCATION:https://researchseminars.org/talk/SympZoominar/34/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Basak Gurel (UCF)
DTSTART;VALUE=DATE-TIME:20210122T141500Z
DTEND;VALUE=DATE-TIME:20210122T154500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/35
DESCRIPTION:Title: Pseudo-rotations vs. rotations\nby Basak Gurel (UCF) as part of
Symplectic zoominar\n\n\nAbstract\nThe talk will focus on the question of
whether existing symplectic methods can distinguish pseudo-rotations from
rotations (i.e.\, elements of Hamiltonian circle actions). For the project
ive plane\, in many instances\, but not always\, the answer is negative. N
amely\, for virtually every pseudo-rotation there exists a unique rotation
with precisely the same fixed-point data. However\, the hypothetical exce
ptions — ghost pseudo-rotations — suggest that the relation between th
e two classes of maps might be much weaker than previously thought\, possi
bly leading to some unexpected consequences. This is based on joint work w
ith Viktor Ginzburg.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/35/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Three 20 min research talks: Alexandre Jannaud (Sorbonne)\; Tim La
rge (MIT)\; Oliver Edtmair (Berkeley)
DTSTART;VALUE=DATE-TIME:20210129T141500Z
DTEND;VALUE=DATE-TIME:20210129T154500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/36
DESCRIPTION:by Three 20 min research talks: Alexandre Jannaud (Sorbonne)\;
Tim Large (MIT)\; Oliver Edtmair (Berkeley) as part of Symplectic zoomina
r\n\n\nAbstract\nAlexandre Jannaud (University of Neuchatel)\, Dehn-Seidel
twist\, C^0 symplectic geometry and barcodes\n\nAbstract. In this talk I
will present my work initiating the study of the $C^0$ symplectic mapping
class group\, i.e. the group of isotopy classes of symplectic homeomorphis
ms\, and briefly present the proofs of the first results regarding the top
ology of the group of symplectic homeomorphisms. For that purpose\, we wil
l introduce a method coming from Floer theory and barcodes theory. Applyin
g this strategy to the Dehn-Seidel twist\, a symplectomorphism of particul
ar interest when studying the symplectic mapping class group\, we will gen
eralize to $C^0$ settings a result of Seidel concerning the non-triviality
of the mapping class of this symplectomorphism. We will indeed prove that
the generalized Dehn twist is not in the connected component of the ident
ity in the group of symplectic homeomorphisms. Doing so\, we prove the non
-triviality of the $C^0$ symplectic mapping class group of some Liouville
domains.\n\nTim Large (MIT)\, Floer K-theory and exotic Liouville manifold
s\n\nAbstract: In this short talk\, I will explain how to construct Liouvi
lle manifolds which have zero traditional symplectic cohomology but intere
sting symplectic K-theory. In particular\, we construct an exotic symplect
ic structure on Euclidean space which is not distinguished by traditional
Floer homology invariants. Instead\, it is detected by a module spectrum f
or complex K-theory\, built as a variant of Cohen-Jones-Segal’s Floer ho
motopy type. The proof involves passage through (wrapped) Fukaya categorie
s with coefficients in a ring spectrum\, rather than an ordinary ring.\n\n
\nOliver Edtmair (Berkeley)\, 3D convex contact forms and the Ruelle invar
iant \n\nAbstract. Is every dynamically convex contact form on the three s
phere convex? In this talk I will explain why the answer to this question
is no. The strategy is to derive a lower bound on the Ruelle invariant of
convex contact forms and construct dynamically convex contact forms violat
ing this lower bound. This is based on joint work with Julian Chaidez.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/36/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yusuf Baris Kartal (Princeton)
DTSTART;VALUE=DATE-TIME:20210205T141500Z
DTEND;VALUE=DATE-TIME:20210205T154500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/37
DESCRIPTION:Title: Algebraic torus actions on Fukaya categories and tameness of change
in Floer homology under symplectic isotopies.\nby Yusuf Baris Kartal (
Princeton) as part of Symplectic zoominar\n\n\nAbstract\nThe purpose of th
is talk is to explore how Lagrangian Floer homology groups change under (n
on-Hamiltonian) symplectic isotopies on a (negatively) monotone symplectic
manifold $(M\,\\omega)$ satisfying a strong non-degeneracy condition. Mor
e precisely\, given two Lagrangian branes $L\,L'$\, consider family of Flo
er homology groups $HF(\\phi_v(L)\,L')$\, where $v\\in H^1(M\,\\mathbb R)$
and $\\phi_v$ is the time-1 map of a symplectic isotopy with flux $v$. We
show how to fit this collection into an algebraic sheaf over the algebrai
c torus $H^1(M\,\\mathbb G_m)$. The main tool is the construction of an "a
lgebraic action" of $H^1(M\,\\mathbb G_m)$ on the Fukaya category. As an a
pplication\, we deduce the change in Floer homology groups satisfy various
tameness properties\, for instance\, the dimension is constant outside an
algebraic subset of $H^1(M\,\\mathbb G_m)$. Similarly\, given closed $1$-
form $\\alpha$\, which generates a symplectic isotopy denoted by $\\phi_\\
alpha^t$\, the Floer homology groups $HF(\\phi_\\alpha^t(L)\,L')$ have ran
k that is constant in $t$\, with finitely many possible exceptions.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/37/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cheuk Yu Mak (Edinburgh)
DTSTART;VALUE=DATE-TIME:20210212T141500Z
DTEND;VALUE=DATE-TIME:20210212T154500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/38
DESCRIPTION:Title: Non-displaceable Lagrangian links in four-manifolds\nby Cheuk Yu
Mak (Edinburgh) as part of Symplectic zoominar\n\n\nAbstract\nOne of the
earliest fundamental applications of Lagrangian Floer theory is detecting
the non-displaceablity of a Lagrangian submanifold. Many progress and gen
eralisations have been made since then but little is known when the Lagran
gian submanifold is disconnected. In this talk\, we describe a new idea t
o address this problem. Subsequently\, we explain how to use Fukaya-Oh-Oh
ta-Ono and Cho-Poddar theory to show that for every S^2 \\times S^2 with a
non-monotone product symplectic form\, there is a continuum of disconnect
ed\, non-displaceable Lagrangian submanifolds such that each connected com
ponent is displaceable. This is a joint work with Ivan Smith.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/38/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Daniel Pomerleano (Boston)
DTSTART;VALUE=DATE-TIME:20210219T141500Z
DTEND;VALUE=DATE-TIME:20210219T154500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/39
DESCRIPTION:Title: Intrinsic mirror symmetry and categorical crepant resolutions\nb
y Daniel Pomerleano (Boston) as part of Symplectic zoominar\n\n\nAbstract\
nGross and Siebert have recently proposed an "intrinsic" programme for stu
dying mirror symmetry. In this talk\, we will discuss a symplectic interpr
etation of some of their ideas in the setting of affine log Calabi-Yau var
ieties. Namely\, we describe work in progress which shows that\, under sui
table assumptions\, the wrapped Fukaya category of such a variety X gives
an intrinsic "categorical crepant resolution" of Spec(SH0(X)). No backgrou
nd in mirror symmetry will be assumed for the talk.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/39/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sylvain Courte (Université Grenoble Alpes)
DTSTART;VALUE=DATE-TIME:20210226T141500Z
DTEND;VALUE=DATE-TIME:20210226T154500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/40
DESCRIPTION:Title: Twisted generating functions and the nearby Lagrangian conjecture (P
art of the Generating Functions Day joint with Western Hemisphere Virtual
Symplectic Seminar)\nby Sylvain Courte (Université Grenoble Alpes) as
part of Symplectic zoominar\n\n\nAbstract\nI will explain the notion of t
wisted generating function and show that a closed exact Lagrangian submani
fold L in the cotangent bundle of M admits such a thing. The type of funct
ion arising in our construction is related to Waldhausen's tube space from
his manifold approach to algebraic K-theory of spaces. Using the rational
equivalence of this space with BO\, as proved by Bökstedt\, we conclude
that the stable Lagrangian Gauss map of L vanishes on all homotopy groups.
In particular when M is a homotopy sphere\, we obtain the triviality of t
he stable Lagrangian Gauss map and a genuine generating function for L. Th
is is a joint work with M. Abouzaid\, S. Guillermou and T. Kragh.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/40/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sobhan Seyfaddini (IMJ-PRG)
DTSTART;VALUE=DATE-TIME:20210305T141500Z
DTEND;VALUE=DATE-TIME:20210305T154500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/41
DESCRIPTION:Title: Periodic Floer homology and the large-scale geometry of Hofer's metr
ic on the sphere\nby Sobhan Seyfaddini (IMJ-PRG) as part of Symplectic
zoominar\n\n\nAbstract\nThe large-scale geometry of Hofer's has been stud
ied since the 90s and has seen much progress for a large class of symplect
ic manifolds. However\, the case of the two-sphere has remained very myste
rious\, especially in comparison to other surfaces. For example\, a well-k
nown conjecture of Kapovich and Polterovich\, from 2006\, states that\, on
the two-sphere\, Hofer's metric is not quasi-isometric to the real line.
I will explain how invariants from periodic Floer homology can be used to
answer this question. Time permitting we will also discuss connections to
continuous symplectic topology. This is based on joint work with Dan Crist
ofaro-Gardiner and Vincent Humilière.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/41/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Oleg Lazarev (Harvard)
DTSTART;VALUE=DATE-TIME:20210312T141500Z
DTEND;VALUE=DATE-TIME:20210312T154500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/42
DESCRIPTION:Title: Inverting primes in Weinstein geometry\nby Oleg Lazarev (Harvard
) as part of Symplectic zoominar\n\n\nAbstract\nA classical construction i
n topology associates to a space $X$ and prime $p$\, a new "localized" spa
ce $X_p$ whose homotopy and homology groups are obtained from those of $X
$ by inverting $p$. In this talk\, I will discuss a symplectic analog of t
his construction\, extending work of Abouzaid-Seidel and Cieliebak-Eliashb
erg on flexible Weinstein structures. Concretely\, I will produce prime-lo
calized Weinstein subdomains of high-dimensional Weinstein domains and als
o show that any Weinstein subdomain of a cotangent bundle agrees Fukaya-ca
tegorically with one of these special subdomains. The key will be to class
ify which objects of the Fukaya category of $T^{\\ast} M$ – twisted com
plexes of Lagrangians – are quasi-isomorphic to actual Lagrangians. This
talk is based on joint work with Z. Sylvan.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/42/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Egor Shelukhin (UdeM)
DTSTART;VALUE=DATE-TIME:20210319T131500Z
DTEND;VALUE=DATE-TIME:20210319T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/43
DESCRIPTION:Title: Lagrangian configurations and Hamiltonian maps\nby Egor Shelukhi
n (UdeM) as part of Symplectic zoominar\n\n\nAbstract\nWe study configurat
ions of disjoint Lagrangian submanifolds in certain low-dimensional symple
ctic manifolds from the perspective of the geometry of Hamiltonian maps. W
e detect infinite-dimensional flats in the Hamiltonian group of the two-sp
here equipped with Hofer's metric\, showing in particular that this group
is not quasi-isometric to a line. This answers a well-known question of Ka
povich-Polterovich from 2006. We show that these flats in $Ham(S^2)$ stabi
lize to certain product four-manifolds\, prove constraints on Lagrangian p
acking\, and find new instances of Lagrangian Poincare recurrence. The tec
hnology involves Lagrangian spectral invariants with Hamiltonian term in s
ymmetric product orbifolds. This is joint work with Leonid Polterovich.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/43/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jesse Huang(UIUC)/Shaoyun Bai(Princeton)/Thomas Melistas(UGA)
DTSTART;VALUE=DATE-TIME:20210326T131500Z
DTEND;VALUE=DATE-TIME:20210326T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/44
DESCRIPTION:Title: Three short research talks of 20 min each.\nby Jesse Huang(UIUC)
/Shaoyun Bai(Princeton)/Thomas Melistas(UGA) as part of Symplectic zoomina
r\n\n\nAbstract\nJesse Huang(UIUC)\, Variation of FLTZ skeleta.\n\nIn this
short talk\, I will discuss an interpolation of FLTZ skeleta mirror to de
rived equivalent toric varieties. This is joint work with Peng Zhou.\n\nSh
aoyun Bai(Princeton)\, $SU(n)$–Casson invariants and symplectic geometry
.\n\nIn 1985\, Casson introduced an invariant of integer homology 3-sphere
s by counting $SU(2)$-representations of the fundamental groups. The gener
alization of Casson invariant by considering Lie groups $SU(n)$ has been l
ong expected\, but the original construction of Casson encounters some dif
ficulties. I will present a solution to this problem\, highlighting the eq
uivariant symplectic geometry and Atiyah-Floer type result entering the co
nstruction.\n\nThomas Melistas(UGA)\, The Large-Scale Geometry of Overtwis
ted Contact Forms.\n\nInspired by the symplectic Banach-Mazur distance\, p
roposed by Ostrover and Polterovich in the setting of non-degenerate stars
haped domains of Liouville manifolds\, we define a distance on the space o
f contact forms supporting a given contact structure on a closed contact m
anifold and we use it to bi-Lipschitz embed part of the 2-dimensional Eucl
idean space into the space of overtwisted contact forms supporting a given
contact structure on a smooth closed manifold.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/44/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sheel Ganatra (USC)
DTSTART;VALUE=DATE-TIME:20210402T131500Z
DTEND;VALUE=DATE-TIME:20210402T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/45
DESCRIPTION:Title: Categorical non-properness in wrapped Floer theory\nby Sheel Gan
atra (USC) as part of Symplectic zoominar\n\n\nAbstract\nIn all known expl
icit computations on Weinstein manifolds\, the self-wrapped Floer homology
of non-compact exact Lagrangian is always either infinite-dimensional or
zero. We will explain why a global variant of this observed phenomenon hol
ds in broad generality: the wrapped Fukaya category of any Weinstein (or n
on-degenerate Liouville) manifold is always either non-proper or zero\, as
is any quotient thereof. Moreover any non-compact connected exact Lagrang
ian is always either a "non-proper object" or zero in such a wrapped Fukay
a category\, as is any idempotent summand thereof. We will also examine wh
ere the argument could break if one drops exactness\, which is consistent
with known computations of non-exact wrapped Fukaya categories which are s
mooth\, proper\, and non-vanishing (e.g.\, work of Ritter-Smith).\n
LOCATION:https://researchseminars.org/talk/SympZoominar/45/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sara Tukachinsky (IAS)
DTSTART;VALUE=DATE-TIME:20210409T131500Z
DTEND;VALUE=DATE-TIME:20210409T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/46
DESCRIPTION:Title: Relative quantum cohomology and other stories\nby Sara Tukachins
ky (IAS) as part of Symplectic zoominar\n\n\nAbstract\nWe define a quantum
product on the cohomology of a symplectic manifold relative to a Lagrangi
an submanifold\, with coefficients in a Novikov ring. The associativity of
this product is equivalent to an open version of the WDVV equations for a
n appropriate disk superpotential. Both structures — the quantum product
and the WDVV equations — are consequences of a more general structure w
e call the tensor potential\, which will be the main focus of this talk. T
his is joint work with Jake Solomon.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/46/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Maxim Jeffs/Côme Dattin/Bingyu Zhang (Harvard/Nantes/Université
Grenoble Alpes)
DTSTART;VALUE=DATE-TIME:20210416T131500Z
DTEND;VALUE=DATE-TIME:20210416T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/47
DESCRIPTION:Title: Three 20min research talks\nby Maxim Jeffs/Côme Dattin/Bingyu Z
hang (Harvard/Nantes/Université Grenoble Alpes) as part of Symplectic zoo
minar\n\n\nAbstract\nMirror symmetry and Fukaya categories of singular var
ieties (Maxim Jeffs)\n\nIn this talk I will explain Auroux' definition of
the Fukaya category of a singular hypersurface and two results about this
definition\, illustrated with some examples. The first result is that Auro
ux' category is equivalent to the Fukaya-Seidel category of a Landau-Ginzb
urg model on a smooth variety\; the second result is a homological mirror
symmetry equivalence at certain large complex structure limits. I will als
o discuss ongoing work on generalizations.\n\nWrapped sutured Legendrian h
omology and the conormal of braids (Côme Dattin)\n\nIn this talk we will
discuss invariants of sutured Legendrians. A sutured contact manifold can
be seen as either generalizing the contactisation of a Liouville domain\,
or as a presentation of a contact manifold with convex boundary. Using the
first point of view\, we define the wrapped sutured homology of Legendria
ns with boundary\, employing ideas coming from Floer theory. To illustrate
the second aspect\, we apply the unit conormal construction to braids wit
h two strands\, which yields a sutured Legendrian. We will show that\, if
the conormals of two 2-braids are Legendrian isotopic\, then the braids ar
e equivalent.\n\nCapacities from the Chiu-Tamarkin complex (Bingyu Zhang)\
n\nIn this talk\, we will discuss the Chiu-Tamarkin complex. It is a sympl
ectic/contact invariant that comes from the microlocal sheaf theory. I wil
l explain how to define some capacities using the Chiu-Tamarkin complex in
both symplectic and contact situations. The main result is the structure
theorem of the Chiu-Tamarkin complex of convex toric domains. Consequently
\, we can compute the capacities of convex toric domains.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/47/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Laura Starkston (UC Davis)
DTSTART;VALUE=DATE-TIME:20210507T131500Z
DTEND;VALUE=DATE-TIME:20210507T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/48
DESCRIPTION:Title: Unexpected fillings\, singularities\, and plane curve arrangements\nby Laura Starkston (UC Davis) as part of Symplectic zoominar\n\n\nAbst
ract\nI will discuss joint work with Olga Plamenevskaya studying symplecti
c fillings of links of certain complex surface singularities\, and compari
ng symplectic fillings with complex smoothings. We develop characterizatio
ns of the symplectic fillings using planar Lefschetz fibrations and singul
ar braided surfaces. This provides an analogue of de Jong and van Straten'
s work which characterizes the complex smoothings in terms of decorated co
mplex plane curves. We find differences between symplectic fillings and co
mplex smoothings that had not previously been found in rational complex su
rface singularities.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/48/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Daniel Álvarez-Gavela (MIT)
DTSTART;VALUE=DATE-TIME:20210514T131500Z
DTEND;VALUE=DATE-TIME:20210514T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/49
DESCRIPTION:Title: Caustics of Lagrangian homotopy spheres with stably trivial Gauss ma
p\nby Daniel Álvarez-Gavela (MIT) as part of Symplectic zoominar\n\n\
nAbstract\nThe h-principle for the simplification of caustics (i.e. Lagran
gian tangencies) reduces a geometric problem to a homotopical problem. In
this talk I will explain the solution to this homotopical problem in the c
ase of spheres. More precisely\, I will show that the stably trivial eleme
nts of the nth homotopy group of the Lagrangian Grassmannian $U_n/O_n$\n\,
which lies in the metastable range\, admit representatives with only fold
type tangencies. By the h-principle\, it follows that if $D$ is a Lagrang
ian distribution defined along a Lagrangian homotopy sphere $L$\, then the
re exists a Hamiltonian isotopy which simplifies the tangencies between $L
$ and $D$ to consist only of folds if and only if $D$ is stably trivial. I
will give two applications of this result\, one to the arborealization pr
ogram and another to the study of nearby Lagrangian homotopy spheres. Join
t work with David Darrow (in the form of an undergraduate research project
).\n
LOCATION:https://researchseminars.org/talk/SympZoominar/49/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Oğuz Şavk/Irene Seifert/Hang Yuan (Boğaziçi University/Heidelb
erg/Stony Brook)
DTSTART;VALUE=DATE-TIME:20210528T131500Z
DTEND;VALUE=DATE-TIME:20210528T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/50
DESCRIPTION:Title: Three short research talks of 20 min each.\nby Oğuz Şavk/Irene
Seifert/Hang Yuan (Boğaziçi University/Heidelberg/Stony Brook) as part
of Symplectic zoominar\n\n\nAbstract\n(Oğuz Şavk) Classical and new plum
bings bounding contractible manifolds and homology balls\n\nA central prob
lem in low-dimensional topology asks which homology 3-spheres bound contra
ctible 4-manifolds and homology 4-balls. In this talk\, we address this pr
oblem for plumbed 3-manifolds and we present the classical and new results
together. Along the way\, we touch symplectic geometry by using the class
ical results of Eliashberg and Gompf. Our approach is based on Mazur’s f
amous argument which provides a unification of all results.\n\n(Irene Seif
ert) Periodic delay orbits and the polyfold IFT\n\nDifferential delay equa
tions arise very naturally\, but they are much more complicated than ordin
ary differential equations. Polyfold theory\, originally developed for the
study of moduli spaces of pseudoholomorphic curves\, can help to understa
nd solutions of certain delay equations. In my talk\, I will show an exist
ence result about periodic delay orbits with small delay. If time permits\
, we can discuss possible further applications of polyfold theory to the d
ifferential delay equations. This is joint work with Peter Albers.\n\n(Han
g Yuan) Disk counting via family Floer theory\n\nGiven a family of Lagrang
ian tori with full quantum corrections\, the non-archimedean SYZ mirror co
nstruction uses the family Floer theory to construct a non-archimedean ana
lytic space with a global superpotential. In this talk\, we will first bri
efly review the construction. Then\, we will apply it to the Gross’s fib
rations. As an application\, we can compute all the non-trivial open GW in
variants for a Chekanov-type torus in $\\mathbb{CP}^n$ or $\\mathbb{CP}^r\
\times \\mathbb{CP}^{n-r}$. When $n=2$\, $r=1$\, we retrieve the previous
results of Auroux and Chekanov-Schlenk without finding the disks explicitl
y. It is also compatible with the Pascaleff-Tonkonog’s work on Lagrangia
n mutations.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/50/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Simion Filip (Chicago)
DTSTART;VALUE=DATE-TIME:20210604T131500Z
DTEND;VALUE=DATE-TIME:20210604T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/51
DESCRIPTION:Title: Degenerations of Kahler forms on K3 surfaces\, and some dynamics
\nby Simion Filip (Chicago) as part of Symplectic zoominar\n\n\nAbstract\n
K3 surfaces have a rich geometry and admit interesting holomorphic automor
phisms. As examples of Calabi-Yau manifolds\, they admit Ricci-flat Kähle
r metrics\, and a lot of attention has been devoted to how these metrics d
egenerate as the Kähler class approaches natural boundaries. I will discu
ss how to use the full automorphism group to analyze the degenerations and
obtain certain canonical objects (closed positive currents) on the bounda
ry. While most of the previous work was devoted to degenerating the metric
along an elliptic fibration (motivated by the SYZ picture of mirror symme
try) I will discuss how to analyze all the other points. Time permitting\,
I will also describe the construction of canonical heights on K3 surfaces
(in the sense of number theory)\, generalizing constructions due to Silve
rman and Tate.\nJoint work with Valentino Tosatti.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/51/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Francisco Presas (ICMAT)
DTSTART;VALUE=DATE-TIME:20210611T131500Z
DTEND;VALUE=DATE-TIME:20210611T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/52
DESCRIPTION:Title: The homotopy type of the space of tight contact structures and the o
vertwisted mirage\nby Francisco Presas (ICMAT) as part of Symplectic z
oominar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/SympZoominar/52/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Agustin Moreno (Uppsala)
DTSTART;VALUE=DATE-TIME:20210618T131500Z
DTEND;VALUE=DATE-TIME:20210618T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/53
DESCRIPTION:Title: On the spatial restricted three-body problem\nby Agustin Moreno
(Uppsala) as part of Symplectic zoominar\n\n\nAbstract\nIn his search for
closed orbits in the planar restricted three-body problem\, Poincaré’s
approach roughly reduces to:\n\n(1) Finding a global surface of section\;\
n(2) Proving a fixed-point theorem for the resulting return map.\n\nThis i
s the setting for the celebrated Poincaré-Birkhoff theorem. In this talk\
, I will discuss a generalization of this program to the spatial problem.\
n\nFor the first step\, we obtain the existence of global hypersurfaces of
section for which the return maps are Hamiltonian\, valid for energies be
low the first critical value and all mass ratios. For the second\, we prov
e a higher-dimensional version of the Poincaré-Birkhoff theorem\, which g
ives infinitely many orbits of arbitrary large period\, provided a suitabl
e twist condition is satisfied. Time permitting\, we also discuss a constr
uction that associates a Reeb dynamics on a moduli space of holomorphic cu
rves (a copy of the three-sphere)\, to the given dynamics\, and its proper
ties.\n\nThis is based on joint work with Otto van Koert.\n
LOCATION:https://researchseminars.org/talk/SympZoominar/53/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Laurent Côté (IAS/Harvard)
DTSTART;VALUE=DATE-TIME:20210709T131500Z
DTEND;VALUE=DATE-TIME:20210709T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/54
DESCRIPTION:by Laurent Côté (IAS/Harvard) as part of Symplectic zoominar
\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/SympZoominar/54/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Helmut Hofer (IAS)
DTSTART;VALUE=DATE-TIME:20210716T131500Z
DTEND;VALUE=DATE-TIME:20210716T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/55
DESCRIPTION:Title: The Floer Jungle: 35 years of Floer Theory\nby Helmut Hofer (IAS
) as part of Symplectic zoominar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/SympZoominar/55/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mohan Swaminathan/Ben Wormleighton/Jonathan Zung (Princeton/WashU/
Princeton)
DTSTART;VALUE=DATE-TIME:20210625T131500Z
DTEND;VALUE=DATE-TIME:20210625T144500Z
DTSTAMP;VALUE=DATE-TIME:20210613T000331Z
UID:SympZoominar/56
DESCRIPTION:Title: Three short research talks of 20 min each\nby Mohan Swaminathan/
Ben Wormleighton/Jonathan Zung (Princeton/WashU/Princeton) as part of Symp
lectic zoominar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/SympZoominar/56/
END:VEVENT
END:VCALENDAR