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BEGIN:VEVENT
SUMMARY:Axel Kleinschmidt (AEI Potsdam)
DTSTART;VALUE=DATE-TIME:20200501T123000Z
DTEND;VALUE=DATE-TIME:20200501T133000Z
DTSTAMP;VALUE=DATE-TIME:20240328T092339Z
UID:EGSS/1
DESCRIPTION:Title: EFT
s and ExFTs\nby Axel Kleinschmidt (AEI Potsdam) as part of Exceptional
geometry seminar series\n\n\nAbstract\nI will discuss how exceptional fie
ld theory can be used to compute aspects of the low-energy effective field
theory description of type II string theory. Since exceptional field theo
ry also includes the description of (exotic) branes\, one can also determi
ne the exact non-perturbative contributions to certain higher-derivative c
ouplings. Emphasis will be put on recent advances for 1/8-BPS couplings th
at are connected to tropical limits of string invariants at genus two.\n
LOCATION:https://researchseminars.org/talk/EGSS/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Riccardo Borsato (Santiago de Compostela U.\, IGFAE)
DTSTART;VALUE=DATE-TIME:20200515T123000Z
DTEND;VALUE=DATE-TIME:20200515T133000Z
DTSTAMP;VALUE=DATE-TIME:20240328T092339Z
UID:EGSS/2
DESCRIPTION:Title: Loc
al beta-shifts and alpha'-corrections\nby Riccardo Borsato (Santiago d
e Compostela U.\, IGFAE) as part of Exceptional geometry seminar series\n\
n\nAbstract\nLocal (i.e. non-constant) beta shifts of O(D\,D) are a soluti
on-generating technique in supergravity\, when additional conditions are i
mposed on beta. In the literature this construction has been known as "hom
ogeneous Yang-Baxter deformation"\, and it was first introduced to generat
e integrable deformations of 2d sigma-models. Interest on such deformation
s is also motivated by their relation to non-abelian T-duality. In this ta
lk I will review some aspects of this subject and I will explain how to ob
tain alpha'-corrections for the deformed backgrounds by exploiting the Dou
ble Field Theory formulation.\n
LOCATION:https://researchseminars.org/talk/EGSS/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:David Tennyson (Imperial College London)
DTSTART;VALUE=DATE-TIME:20200508T123000Z
DTEND;VALUE=DATE-TIME:20200508T133000Z
DTSTAMP;VALUE=DATE-TIME:20240328T092339Z
UID:EGSS/3
DESCRIPTION:Title: Gen
eralising G2 geometry: involutivity\, moment maps and moduli\nby David
Tennyson (Imperial College London) as part of Exceptional geometry semina
r series\n\n\nAbstract\nUnderstanding the geometry of flux backgrounds of
string theory and M-theory is an important problem in phenomenology. Most
attempts at this require studying backgrounds according to torsion classes
\, or treating the flux perturbatively through moduli stabilisation. Howev
er\, in both cases we either lose analytic tractability by losing the inte
grable G-structures that characterise the fluxless backgrounds\, or we get
only approximate results for small flux. In this talk we will show that g
eneric flux backgrounds can be described by integrable SU(7) structures in
exceptional generalised geometry. These structures have properties remini
scent of conventional complex structures\, being described by an involutiv
e subbundle of the generalised tangent bundle\, and a vanishing moment map
. Using this structure we will be able to find the exact moduli of broad c
lasses of flux backgrounds. This description of flux backgrounds also prov
ides a new interpretation of G2 manifolds\, which may have interesting lin
ks with geometric invariant theory and new exceptional Hitchin functionals
.\n
LOCATION:https://researchseminars.org/talk/EGSS/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chris Blair (Vrije U. Brussels)
DTSTART;VALUE=DATE-TIME:20200522T123000Z
DTEND;VALUE=DATE-TIME:20200522T133000Z
DTSTAMP;VALUE=DATE-TIME:20240328T092339Z
UID:EGSS/4
DESCRIPTION:Title: Non
-relativistic duality and TTbar deformations\nby Chris Blair (Vrije U.
Brussels) as part of Exceptional geometry seminar series\n\n\nAbstract\nS
tarting with some particular physical theory\, we are often interested in
then exploring the space of all physical theories either by adding deforma
tions or taking limits. I will describe a connection between two seemingly
unrelated such explorations. The first is the TTbar deformation of two-di
mensional field theories. The second is the non-relativistic limit of stri
ng theory. It is well-known that the TTbar deformation of D free bosons le
ads to the Nambu-Goto action in D+2 dimensions\; I will explain how the li
mit where the deformation parameter returns to zero can be viewed as a non
-relativistic limit of the string. In order to describe and generalise thi
s correspondence\, I will use intuition gained from the O(D\,D) covariant
"doubled" formulation of string theory geometry. This is natural here as T
Tbar deformations can be viewed as TsT or bivector transformations\, while
non-relativistic limits which are singular in terms of the standard space
time geometry become well-defined in terms of doubled variables. Time perm
itting I will say something about possible generalisations using exception
al geometry.\n\nBased on: https://arxiv.org/abs/2002.12413\n
LOCATION:https://researchseminars.org/talk/EGSS/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gregoire Josse (LPTHE Paris)
DTSTART;VALUE=DATE-TIME:20200529T123000Z
DTEND;VALUE=DATE-TIME:20200529T133000Z
DTSTAMP;VALUE=DATE-TIME:20240328T092339Z
UID:EGSS/5
DESCRIPTION:Title: Gen
eralised Geometry and consistent truncation\nby Gregoire Josse (LPTHE
Paris) as part of Exceptional geometry seminar series\n\n\nAbstract\nConsi
stent truncations of ten- and eleven- dimensions supergravity are useful t
ools in order to derive lower-dimensional effective theory\, but are usual
ly difficult to obtain. Generalised geometry provides a well suited frame
work to derive consistent truncations in arbitrary dimension and with diff
erent amount of supersymmetry\, based on the notion of generalised G-struc
ture. In this talk I will present first the general ideas in generic dimen
sion and amount of supersymmetry. Then I will show how to apply the formal
ism to truncations to half-maximal supergravity in five dimensions. As con
crete examples\, I will present an M-theory truncation that contains the M
aldacena Nunez solutions for M5-branes wrapped on a Riemann surface.\n
LOCATION:https://researchseminars.org/talk/EGSS/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Camille Eloy (ENS Lyon)
DTSTART;VALUE=DATE-TIME:20200605T123000Z
DTEND;VALUE=DATE-TIME:20200605T133000Z
DTSTAMP;VALUE=DATE-TIME:20240328T092339Z
UID:EGSS/6
DESCRIPTION:Title: Dua
lity invariance and higher derivatives\nby Camille Eloy (ENS Lyon) as
part of Exceptional geometry seminar series\n\n\nAbstract\nT-duality impli
es that string theories\, once compactified on a d-dimensional torus\, mus
t have a global O(d\,d)symmetry. The exact interplay between this duality
and α'-corrections is however not known. In this talk\, I will expose new
tools to tackle this problem and show\, considering the bosonic string th
eory to first order in α'\, that this symmetry requires a Green-Schw
arz type mechanism for α'-deformed O(d\,d) transformations.\n
LOCATION:https://researchseminars.org/talk/EGSS/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Olaf Hohm (Humboldt U. Berlin)
DTSTART;VALUE=DATE-TIME:20200612T133000Z
DTEND;VALUE=DATE-TIME:20200612T143000Z
DTSTAMP;VALUE=DATE-TIME:20240328T092339Z
UID:EGSS/7
DESCRIPTION:Title: Dua
lity Hierarchies (UNUSUAL TIME)\nby Olaf Hohm (Humboldt U. Berlin) as
part of Exceptional geometry seminar series\n\n\nAbstract\nGauged supergra
vity as well as double and exceptional field theory can be formulated in t
erms of a hierarchy of duality relations between curvatures originating fr
om the tensor hierarchy. The needed higher algebraic structures can be der
ived from a differential graded Lie algebra.\nI outline how exceptional fi
eld theory fits into this scheme by showing that its generalized geometric
structures can be naturally interpreted in terms of an embedding tensor m
ap and an infinite-dimensional Lie algebra.\n\n(Seminar starts one hour la
ter than usual).\n
LOCATION:https://researchseminars.org/talk/EGSS/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Aybike Catal-Ozer (Tech. U. Istanbul)
DTSTART;VALUE=DATE-TIME:20200619T123000Z
DTEND;VALUE=DATE-TIME:20200619T133000Z
DTSTAMP;VALUE=DATE-TIME:20240328T092339Z
UID:EGSS/8
DESCRIPTION:Title: Non
-abelian T-duality as a transformation in double field theory\nby Aybi
ke Catal-Ozer (Tech. U. Istanbul) as part of Exceptional geometry seminar
series\n\n\nAbstract\nWe show that Non-Abelian T-duality (NATD) can be des
cribed as a coordinate dependent O(D\,D) transformation for supergravity f
ields in the NS-NS sector and as a Pin(D\,D) transformation for the fields
in the RR sector. This enables us to show that NATD is a solution generat
ing transformation in Double Field Theory (DFT)\, by regarding the transfo
rmed fields as duality twisted fields in the context ofGauged Double Field
Theory (GDFT) of Type II strings. When the isometry algebra is non-unimod
ular\, consistency of GDFT forces the generalized dilaton field to have a
linear dependence on the winding type coordinates of DFT\, implying that t
he transformed fields satisfy the field equations of DFT in the generalize
d supergravity frame. We also discuss briefly the analogous story for Yang
-Baxterdeformations.\n
LOCATION:https://researchseminars.org/talk/EGSS/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gianluca Inverso (Queen Mary U. of London and INFN sez. di Padova)
DTSTART;VALUE=DATE-TIME:20200626T123000Z
DTEND;VALUE=DATE-TIME:20200626T133000Z
DTSTAMP;VALUE=DATE-TIME:20240328T092339Z
UID:EGSS/9
DESCRIPTION:Title: On
uplift conditions for gauged supergravities\nby Gianluca Inverso (Quee
n Mary U. of London and INFN sez. di Padova) as part of Exceptional geomet
ry seminar series\n\n\nAbstract\nSupergravity theories can be consistently
truncated to lower dimensional gauged supergravities\, which has many app
lications especially for the purpose of solution generation. A much studie
d class of truncations are generalised Scherk–Schwarz (gSS) reductions.
While the principle of such truncations is well-understood and many exampl
es are known\, there is no complete classification of gSS reductions. Conv
ersely\, it can be difficult to know if a specific gauged supergravity can
arise from a generalised Scherk–Schwarz truncation of some higher-dimen
sional model.\nI will review some results on the general recipe for constr
ucting generalised Scherk–Schwarz uplifts of gauged supergravities and o
n the conditions for such uplifts to exist. I will then discuss work in pr
ogress in rephrasing such uplift conditions as linear constraints and comm
ent on the extension to three-dimensional gauged supergravities and lower\
, where the associated exceptional geometries become more complicated.\n
LOCATION:https://researchseminars.org/talk/EGSS/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Victor Lekeu (Imperial College London)
DTSTART;VALUE=DATE-TIME:20200710T123000Z
DTEND;VALUE=DATE-TIME:20200710T133000Z
DTSTAMP;VALUE=DATE-TIME:20240328T092339Z
UID:EGSS/10
DESCRIPTION:Title: Ho
motopy transfer and L-infinity algebras\nby Victor Lekeu (Imperial Col
lege London) as part of Exceptional geometry seminar series\n\n\nAbstract\
nL-infinity algebras are a generalization of Lie algebras involving\,besid
es a 2-bracket\, a potentially infinite number of higher-order brackets wh
ich satisfy generalized Jacobi identities. In particular\, the usual Jacob
i identity for the 2-bracket is violated by terms involving a 3-bracket. O
riginally discovered in physics in the context of closed string field theo
ry\, it has since been understood that an L-infinity algebra can in fact b
e associated to any classical field theory\; the Jacobi identities then en
code gauge-invariance of the equations of motion\, Noether identities and
all that\, in a way similar to the BRST-BV field-antifield formalism. \n
In this talk\, I will first review the definition of L-infinity algebras
\, in two complementary ways: 1) the original formulation involving an inf
inite number of brackets\, which can be neatly packaged in a nilpotent cod
erivation\, and 2) the dual picture\, where L-infinity relations are encod
ed in a nilpotent derivation. (For field theories\, this derivation is not
hing but the BRST-BV differential.) Then\, I will explain the mathematical
notion of homotopy transfer: how\, under certain conditions\, the L-infin
ity structure can descend to a subspace of the original vector space. In t
he field theory context\, this corresponds to the notion of (tree-level) i
ntegrating out of degrees of freedom\, with the smaller L-infinity algebra
encoding the algebraic structure of the effective theory. \n This is b
ased on work in progress with Alex S. Arvanitakis\, Chris Hull and Olaf Ho
hm.\n
LOCATION:https://researchseminars.org/talk/EGSS/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Saskia Demulder (MPI Munich)
DTSTART;VALUE=DATE-TIME:20200717T123000Z
DTEND;VALUE=DATE-TIME:20200717T133000Z
DTSTAMP;VALUE=DATE-TIME:20240328T092339Z
UID:EGSS/11
DESCRIPTION:Title: In
tegrable deformation of CPn and generalised Kähler geometry\nby Saski
a Demulder (MPI Munich) as part of Exceptional geometry seminar series\n\n
\nAbstract\nGeneralised geometry has proven to be a central framework to u
nderstand T- and U-duality. In particular it provides a critical language
to understand two-dimensional deformations of non-linear sigma-models on g
roup manifolds and coset spaces which admit Poisson-Lie symmetry. This lat
ter can be seen as a relaxation of the notion of isometry allowing one to
perform a generalised notion of T-duality. In this talk I will discuss jo
int work with F. Hassler\, G. Piccinini\, D. Thompson\, where we studied i
ntegrable deformations of CPn background. Notwithstanding the à priori co
mplexity of these deformations\, we show how the deformed CPn background i
s an example of a bi-Hermitian or generalised Kähler geometry. In additio
n we explain how the generalised Kähler potential can be constructed for
the deformed CPn geometry and provide explicit forms for n=1\,2.\n
LOCATION:https://researchseminars.org/talk/EGSS/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dan Butter (Texas A M)
DTSTART;VALUE=DATE-TIME:20200724T133000Z
DTEND;VALUE=DATE-TIME:20200724T143000Z
DTSTAMP;VALUE=DATE-TIME:20240328T092339Z
UID:EGSS/12
DESCRIPTION:Title: E_
7 ExFT in superspace [UNUSUAL TIME!]\nby Dan Butter (Texas A M) as par
t of Exceptional geometry seminar series\n\n\nAbstract\nExceptional field
theory (ExFT) provides a framework where T and U-duality can be made manif
est. In this talk\, I will discuss how supersymmetry can also be made mani
fest in a superspace ExFT. In this approach\, the fermionic coordinates ar
e unified with the external spacetime coordinates\, which together are act
ed on by external superdiffeomorphisms. The internal space and its section
condition remain purely bosonic. This corresponds to the simplest way one
might construct an exceptional superspace\, but even this proves surprisi
ng: it cannot be done directly with the original supersymmetric formulatio
ns of ExFT\, and one must instead relax or reformulate certain features (s
uch as the vielbein postulates). I will sketch how this works for the case
of E_7. The superspace Bianchi identities then lead to the explicit form
of the on-shell p-form curvatures as well as their duality relations. Vari
ous applications will also be discussed.\n
LOCATION:https://researchseminars.org/talk/EGSS/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Niall Macpherson (IIP\, Brazil)
DTSTART;VALUE=DATE-TIME:20200731T123000Z
DTEND;VALUE=DATE-TIME:20200731T133000Z
DTSTAMP;VALUE=DATE-TIME:20240328T092339Z
UID:EGSS/13
DESCRIPTION:Title: Ad
S$_3$ string vacua and duals to small N=(4\,0) CFTs\nby Niall Macphers
on (IIP\, Brazil) as part of Exceptional geometry seminar series\n\n\nAbst
ract\nThe AdS$_3$/CFT$_2$ correspondence provides the best arena to test t
he holographic paradigm. This is simultaneously due to the relative tracta
bility of 2d CFTs and the world sheet theory on AdS$_3$ backgrounds. Despi
te this\, when compared to their higher dimensional counterparts\, little
effort has been made to construct AdS$_3$ string vacua. I will discuss an
ongoing program to fill this gap.\n\nThere exists a rich variety of superc
onformal algebras in 2d\, with distinct options even for a fixed number o
f supercharges. This makes the problem of classifying holographic duals to
CFTs realising these both interesting and broad. I will discuss how one m
ay systematically realise the various algebras in supergravity\, and make
use of G-structure techniques to find new classes of solutions in 10 and 1
1 dimensions. Particular emphasis will be given to a class of solutions in
massive IIA preserving small ${\\cal N}=(4\,0)$ supersymmetry\, for which
there is a concrete proposal for dual CFTs.\n
LOCATION:https://researchseminars.org/talk/EGSS/13/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tomas Ortin (Madrid IFT)
DTSTART;VALUE=DATE-TIME:20200807T123000Z
DTEND;VALUE=DATE-TIME:20200807T133000Z
DTSTAMP;VALUE=DATE-TIME:20240328T092339Z
UID:EGSS/14
DESCRIPTION:Title: Co
mpactification\, duality and black-hole entropy in stringy black hole
\nby Tomas Ortin (Madrid IFT) as part of Exceptional geometry seminar seri
es\n\n\nAbstract\nIn this talk I will review results obtained by our group
over the last few years concerning the calculation of alpha' corrections
of 4- and 5-dimensional stringy black-hole geometries and the computation
of their Wald entropies\, always in the context of the Heterotic Superstri
ng effective action.\n\nFirst\, I will describe the corrections to that ac
tion in the Bergshoeff-de Roo formalism and how we can compute the corresp
onding corrections to the simplest 5- and 4-dimensional (3- and 4-charge)
stringy black holes.\n\nThen\, I will comment on the problems surrounding
the application of the Iyer-Wald prescription to the calculation of the Wa
ld entropy of those black holes directly in terms of their 10-dimensional
oxidized counterparts and I will argue that the calculation has to be done
using the 4- and 5-dimensional actions.\n\nI will then show how to obtain
these actions by direct dimensional reduction and how they provide us wit
h alpha'-corrected T-duality rules. I will derive duality invariant Wald e
ntropy formulas using the Iyer-Wald prescription and I will show that the
entropies obtained satisfy the expected properties.\n\nFinally\, I will co
mment on the many unresolved problems related to all these issues.\n
LOCATION:https://researchseminars.org/talk/EGSS/14/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Luigi Alfonsi
DTSTART;VALUE=DATE-TIME:20200828T123000Z
DTEND;VALUE=DATE-TIME:20200828T133000Z
DTSTAMP;VALUE=DATE-TIME:20240328T092339Z
UID:EGSS/15
DESCRIPTION:Title: Hi
gher geometric aspects of global Double Field Theory\nby Luigi Alfonsi
as part of Exceptional geometry seminar series\n\n\nAbstract\nHigher diff
erential geometry is a generalization of differential geometry\, where ord
inary geometric structures are replaced by their L∞-versions (such as L
∞groups and L∞algebras). This formalism let the concept of principal b
undle be generalized to the one of "bundle gerbe". This geometric object c
an be equipped with a connection\, whose parallel transport is defined on
surfaces instead of on paths. This will be exactly the global formalizatio
n of the Kalb-Ramond field. We can then say that bundle gerbes are for str
ings what principal bundles are for gauge particles.\n\nDouble Field Theor
y is often referred to as a generalization of Kaluza-Klein Theory that un
ifies a metric and a Kalb-Ramond field\, instead of a gauge field. Can thi
s statement be made geometrically precise? In this talk I will give a simp
le introduction to higher differential geometry\, then I will explore the
idea that DFT can be naturally globalized in this geometric formalism. Fin
ally I will apply this construction to obtain some examples of T-duality.\
n
LOCATION:https://researchseminars.org/talk/EGSS/15/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Henning Samtleben
DTSTART;VALUE=DATE-TIME:20200904T123000Z
DTEND;VALUE=DATE-TIME:20200904T133000Z
DTSTAMP;VALUE=DATE-TIME:20240328T092339Z
UID:EGSS/16
DESCRIPTION:Title: To
ward exotic 6D supergravities: Beyond exceptional field theory\nby Hen
ning Samtleben as part of Exceptional geometry seminar series\n\n\nAbstrac
t\nExotic supergravities are six-dimensional theories with chiral maximal
(4\,0) and (3\,1) supersymmetry\, which instead of a graviton feature exot
ic gauge fields with non-standard Young tableaux representations\, subject
to selfduality constraints. After reduction to 5D they all share the fiel
d content of standard maximal supergravity. While so far these theories ar
e only known in the free limit\, their interacting versions were conjectur
ed by C. Hull to exist and to describe strong coupling limits of N=8 theor
ies in 5D. \n\nI present novel actions in a 5+1 split of coordinates whose
field equations reproduce those of the free bosonic (4\,0) and (3\,1) the
ory\, respectively\, including the selfduality relations. I discuss eviden
ce for a master exceptional field theory formulation with an extended sect
ion constraint that\, depending on the solution\, produces the (4\,0)\, (3
\,1) or the conventional (2\,2) theory.\n
LOCATION:https://researchseminars.org/talk/EGSS/16/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gabriel Larios
DTSTART;VALUE=DATE-TIME:20200911T123000Z
DTEND;VALUE=DATE-TIME:20200911T133000Z
DTSTAMP;VALUE=DATE-TIME:20240328T092339Z
UID:EGSS/17
DESCRIPTION:Title: Ka
luza-Klein spectra and consistent truncations\nby Gabriel Larios as pa
rt of Exceptional geometry seminar series\n\n\nAbstract\nKaluza-Klein spec
tra on string/M-theory solutions depend significantly on whether the solut
ion can be obtained from uplift of a maximal gauged supergravity. For some
solutions of M-theory\, mIIA and IIB obtained from uplift\, I will presen
t the spectrum of KK gravitons and discuss a persistent form of universali
ty when solutions with same (super)symmetry and supergravity spectrum are
present in different theories. The masses thus found can be obtained from
an SL(8)-covariant mass matrix whose trace provides the universal coeffici
ents.\n\nIn the second part of the talk\, I will discuss the spectrum of K
K gravitons around the N=2 AdS_4 solution that is dual to the IR of a cubi
c deformation of ABJM. This solution cannot be obtained from uplift of an
N=8 D=4theory\, and this seems to be linked to the fact that its metric ca
nnot be isometrically embedded in R^8. Further\, the allocation of modes w
ith different spins in N=2 supermultiplets cannot be made KK level by KK l
evel\, but needs space invaders.\n
LOCATION:https://researchseminars.org/talk/EGSS/17/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Charles Strickland-Constable
DTSTART;VALUE=DATE-TIME:20200918T123000Z
DTEND;VALUE=DATE-TIME:20200918T133000Z
DTSTAMP;VALUE=DATE-TIME:20240328T092339Z
UID:EGSS/18
DESCRIPTION:Title: On
symmetries and dynamics of exotic supermultiplets\nby Charles Strickl
and-Constable as part of Exceptional geometry seminar series\n\n\nAbstract
\nI will discuss recent work with Ruben Minasian and Yi Zhang on six-dimen
sional exotic supermultiplets. The main focus of the talk will be on the r
elationship between these multiplets and exceptional symmetries. In partic
ular I will discuss the non-existence of a standard spacetime "section" fo
r these theories and how the exotic graviton appears in the SL(3\,R) Ehler
s symmetry term in algebraic decompositions to three dimensions. I will al
so present an overview of arguments suggesting that the dynamics of these
theories may not reduce to those of supergravity in five dimensions and sk
etch a proposed construction which connects them to three-dimensional supe
rgravity.\n
LOCATION:https://researchseminars.org/talk/EGSS/18/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Justin Kaidi
DTSTART;VALUE=DATE-TIME:20200925T133000Z
DTEND;VALUE=DATE-TIME:20200925T143000Z
DTSTAMP;VALUE=DATE-TIME:20240328T092339Z
UID:EGSS/19
DESCRIPTION:Title: Ex
otic Branes from del Pezzo Surfaces [UNUSUAL TIME]\nby Justin Kaidi as
part of Exceptional geometry seminar series\n\n\nAbstract\nWe revisit a c
orrespondence between toroidal compactifications of M-theory and del Pezzo
surfaces\, in which rational curves on the del Pezzo are related to 1/2-B
PS branes of the corresponding compactification. We argue that curves of h
igher genus correspond to non-geometric backgrounds of the M-theory compac
tifications\, which are related to exotic branes. In particular\, the numb
er of “special directions” of the exotic brane is equal to the genus o
f the corresponding curve. In addition to predicting three new non-geometr
ic backgrounds\, we discuss a relation between addition of curves in the d
el Pezzo and the brane polarization effect.\n
LOCATION:https://researchseminars.org/talk/EGSS/19/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Falk Hassler
DTSTART;VALUE=DATE-TIME:20201002T123000Z
DTEND;VALUE=DATE-TIME:20201002T133000Z
DTSTAMP;VALUE=DATE-TIME:20240328T092339Z
UID:EGSS/20
DESCRIPTION:Title: Qu
antum corrections for generalised T-dualities\nby Falk Hassler as part
of Exceptional geometry seminar series\n\n\nAbstract\nS- and (abelian) T-
duality play a central role in string theory\, but their scope is limited
to highly constrained spacetimes. Generalised T-dualities\, which include
non-abelian and Poisson-Lie T-duality\, apply to a significantly larger cl
ass of target spaces with a wide range of applications. Classically they a
re on an equal footing with abelian T-duality\, but their quantum correcti
ons are much more mysterious and mostly unexplored. I will review the main
problems which have to be solved to make progress in this direction. Afte
rwards\, I demonstrate how recently explored connections between generalis
ed T-dualities\, double field theory\, and consistent truncations allow to
prove that two-loop RG flows are preserved under these dualities. We will
discuss the implications of this result and emphasise how the intriguing
mathematical structures that govern all the currentapplications influence
quantum corrections in a highly non-trivial way.\n
LOCATION:https://researchseminars.org/talk/EGSS/20/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mariana Graña (IPhT Saclay)
DTSTART;VALUE=DATE-TIME:20201009T123000Z
DTEND;VALUE=DATE-TIME:20201009T133000Z
DTSTAMP;VALUE=DATE-TIME:20240328T092339Z
UID:EGSS/21
DESCRIPTION:Title: Th
e generalized geometry of backgrounds with gaugino condensates\nby Mar
iana Graña (IPhT Saclay) as part of Exceptional geometry seminar series\n
\n\nAbstract\nMotivated by their potential to stabilise moduli\, we inspec
t type II backgrounds with gaugino condensates on D-branes. We use the la
nguage of generalized complex geometry which is the most adapted to accoun
t for their back-reaction. After reviewing the effective 4d physics reveal
ed by Kachru\, Kallosh\, Linde and Trivedi\, as well as the basic concepts
of generalized complex geometry\, I will show in this talk how the gaugi
no condensates modify the action and the supersymmetry conditions\, concen
trating on compactifications to four dimensions\, and discuss some of its
salient features. We will show how the equations reproduce the phenomenon
of moduli stabilisation\, and comment on a local solution that matches the
on-shell value obtained from the four-dimensional effective action.\n
LOCATION:https://researchseminars.org/talk/EGSS/21/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hermann Nicolai (MPI Potsdam)
DTSTART;VALUE=DATE-TIME:20201016T123000Z
DTEND;VALUE=DATE-TIME:20201016T133000Z
DTSTAMP;VALUE=DATE-TIME:20240328T092339Z
UID:EGSS/22
DESCRIPTION:Title: St
andard Model Fermions and K(E10)\nby Hermann Nicolai (MPI Potsdam) as
part of Exceptional geometry seminar series\n\n\nAbstract\nThis talk descr
ibes an attempt to amend a scheme originallyproposed by M. Gell-Mann to id
entify the spin-1/2 fermions of N=8supergravity with the quarks and lepton
s of the Standard Model. This proposal relies in an essential way on embed
ding the SU(8) R symmetryinto the infinite-dimensional `maximal compact' s
ubgroup K(E10) of the conjectured duality symmetry E10. I will also mentio
n more recentwork exploring the possible role and significance of the eigh
t massive gravitinos in astrophysics.\n
LOCATION:https://researchseminars.org/talk/EGSS/22/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kanghoon Lee
DTSTART;VALUE=DATE-TIME:20201023T123000Z
DTEND;VALUE=DATE-TIME:20201023T133000Z
DTSTAMP;VALUE=DATE-TIME:20240328T092339Z
UID:EGSS/23
DESCRIPTION:Title: Du
ality manifest approach for double copy\nby Kanghoon Lee as part of Ex
ceptional geometry seminar series\n\n\nAbstract\nI will present a generali
zation of the conventional Kerr-Schild(KS) formalism\, a powerful tool for
constructing exact solutions in general relativity\, to the double field
theory(DFT)\, exceptional field theory (ExFT) and supergravities. First\,
a universal structure of the KS ansatz for the generalized metric for DFT
and ExFT will be introduced. I’ll show that their equations motion reduc
e to linear partial differential equations. Based on this formalism\, I’
ll discuss the exact double copy map\, which represents solutions of the s
upergravity equations in terms of solutions of the Maxwell equation.\n
LOCATION:https://researchseminars.org/talk/EGSS/23/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Roberto Bonezzi
DTSTART;VALUE=DATE-TIME:20201030T133000Z
DTEND;VALUE=DATE-TIME:20201030T143000Z
DTSTAMP;VALUE=DATE-TIME:20240328T092339Z
UID:EGSS/24
DESCRIPTION:by Roberto Bonezzi as part of Exceptional geometry seminar ser
ies\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/EGSS/24/
END:VEVENT
END:VCALENDAR