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BEGIN:VEVENT
SUMMARY:Vincent Van Hemelryck (KU Leuven)
DTSTART;VALUE=DATE-TIME:20211110T150000Z
DTEND;VALUE=DATE-TIME:20211110T160000Z
DTSTAMP;VALUE=DATE-TIME:20230208T061547Z
UID:AnLy/1
DESCRIPTION:Title: Sca
le-separated AdS4 vacua of IIA orientifolds and M-theory\nby Vincent V
an Hemelryck (KU Leuven) as part of AnLy Strings and Fields online seminar
s\n\n\nAbstract\nObtaining string compactifications where the KK scale is
much higher than the cosmological constant scale is quite challenging. Suc
h a separation of scales is however necessary for the theory to be genuine
ly lower-dimensional. In massive type IIA string theory there are such sca
le-separated vacua\, e.g. the DGKT AdS4 solutions. It has been shown recen
tly that the classical orientifold backreaction in these vacua can be tune
d small. In this talk\, I show that massless IIA on the other hand allows
both weakly and strongly coupled AdS4 vacua that exhibit scale separation
and for which the backreaction can be tuned small as well. I will give evi
dence that the strongly coupled solutions can be lifted to scale separated
and sourceless (but classically singular) geometries in 11D supergravity.
\n
LOCATION:https://researchseminars.org/talk/AnLy/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Giuseppe Dibitetto (Padua U.)
DTSTART;VALUE=DATE-TIME:20211124T150000Z
DTEND;VALUE=DATE-TIME:20211124T160000Z
DTSTAMP;VALUE=DATE-TIME:20230208T061547Z
UID:AnLy/2
DESCRIPTION:Title: Non
-perturbative instability of mIIA on AdS_4 x S^6\nby Giuseppe Dibitett
o (Padua U.) as part of AnLy Strings and Fields online seminars\n\n\nAbstr
act\nI will start by reviewing the physics of KK bubbles and their higher-
dimensional generalizations. Secondly\, I will move to discussing slightly
more general situations where the shrinking modulus is the string couplin
g. Subsequently\, I will focus on cases where a Freund-Rubin flux is prese
nt\, thus leading to the necessity of introducing a source. Finally\, I wi
ll discuss the case of massive IIA on a 6-sphere as an explicit realizatio
n of the aforementioned mechanism and provide an appropriate physical inte
rpretation.\n
LOCATION:https://researchseminars.org/talk/AnLy/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ivonne Zavala (Swansea U.)
DTSTART;VALUE=DATE-TIME:20211208T150000Z
DTEND;VALUE=DATE-TIME:20211208T160000Z
DTSTAMP;VALUE=DATE-TIME:20230208T061547Z
UID:AnLy/3
DESCRIPTION:Title: Mul
tifield inflation in string theory and supergravity\nby Ivonne Zavala
(Swansea U.) as part of AnLy Strings and Fields online seminars\n\n\nAbstr
act\nMultifield inflation arises naturally in supergravity and string theo
ry models. When several scalars are active during inflation\, the eta-prob
lem may be circumvented\, while new trajectories with large turns can aris
e\, with interesting observational consequences. I will discuss the prosp
ects of realising these features in supergravity and string theory models
of inflation.\n
LOCATION:https://researchseminars.org/talk/AnLy/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Edgar Shaghoulian (Cornell U.)
DTSTART;VALUE=DATE-TIME:20220112T150000Z
DTEND;VALUE=DATE-TIME:20220112T160000Z
DTSTAMP;VALUE=DATE-TIME:20230208T061547Z
UID:AnLy/4
DESCRIPTION:Title: The
central dogma and cosmological horizons\nby Edgar Shaghoulian (Cornel
l U.) as part of AnLy Strings and Fields online seminars\n\n\nAbstract\nTh
e central dogma of black hole physics – which says that from the outside
a black hole can be described in terms of a quantum system with exp(Area/
4G) states evolving unitarily – has recently been supported by computati
ons indicating that the interior of the black hole is encoded in the Hawki
ng radiation of the exterior. In this paper\, we probe whether such a dogm
a for cosmological horizons has any support from similar computations. The
fact that the de Sitter bifurcation surface is a minimax surface (instead
of a maximin surface) causes problems with this interpretation when tryin
g to import calculations analogous to the AdS case. This suggests anchorin
g extremal surfaces to the horizon itself\, where we formulate a two-sided
extremization prescription and find answers consistent with general expec
tations for a quantum theory of de Sitter space: vanishing total entropy\,
an entropy of A/4G when restricting to a single static patch\, an entropy
of a subregion of the horizon which grows with the region size and threat
ens the central dogma until an island-like transition at half the horizon
size when the entanglement wedge becomes the entire static patch interior\
, and a de Sitter version of the Hartman-Maldacena transition.\n
LOCATION:https://researchseminars.org/talk/AnLy/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Francesc Cunillera (U. Nottingham)
DTSTART;VALUE=DATE-TIME:20220209T150000Z
DTEND;VALUE=DATE-TIME:20220209T160000Z
DTSTAMP;VALUE=DATE-TIME:20230208T061547Z
UID:AnLy/5
DESCRIPTION:Title: Qui
ntessence and the Swampland: tales of parametric and numerical control
\nby Francesc Cunillera (U. Nottingham) as part of AnLy Strings and Fields
online seminars\n\n\nAbstract\nWe provide a detailed discussion of the ma
in theoretical and phenomenological challenges of quintessence model build
ing in any parametric or numerically controlled regime of the moduli space
of string theory. We argue that a working quintessence model requires a l
eading order non-supersymmetric (near) Minkowski vacuum with an axionic fl
at direction away from the boundary of moduli space. This axion\, when lif
ted by subdominant non-perturbative effects\, could drive hilltop quintess
ence only for very tuned initial conditions and a very low inflationary sc
ale.\nOur analysis has a twofold implication: (1) Scenarios which are in a
greement with the swampland dS conjecture\, like AdS and supersymmetric Mi
nkowski vacua\, as well as runaways\, cannot allow for phenomenologically
viable quintessence with full computational control. This raises doubts on
the validity of the swampland dS conjecture since it would imply a strong
tension between quantum gravity and observations. (2) If data will prefer
dynamical dark energy\, axion models based on misalignment mechanisms loo
k more promising than hilltop scenarios which are very contrived.\n
LOCATION:https://researchseminars.org/talk/AnLy/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Daniel Junghans (Harvard U.)
DTSTART;VALUE=DATE-TIME:20220302T150000Z
DTEND;VALUE=DATE-TIME:20220302T160000Z
DTSTAMP;VALUE=DATE-TIME:20230208T061547Z
UID:AnLy/6
DESCRIPTION:Title: (Ca
ncelled) Corrections to the LARGE-Volume Scenario\nby Daniel Junghans
(Harvard U.) as part of AnLy Strings and Fields online seminars\n\n\nAbstr
act\nWe argue that de Sitter vacua in the LARGE-volume scenario of type II
B string theory are vulnerable to various unsuppressed curvature\, warping
and g_s corrections. We discuss how these corrections affect the moduli v
evs\, the vacuum energy and the moduli masses. Our analysis reveals that t
he corrections are parametrically larger in the relevant expressions than
one might have guessed from their suppression in the off-shell potential.
Some corrections appear without any parametric suppression at all\, which
makes them particularly dangerous for candidate de Sitter vacua. Other typ
es of corrections can in principle be made small for appropriate parameter
choices. However\, we show in an explicit model that this is never possib
le for all corrections at the same time when the vacuum energy is positive
.\n
LOCATION:https://researchseminars.org/talk/AnLy/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Marios Petropoulos (Ecole Polytechnique\, CPHT)
DTSTART;VALUE=DATE-TIME:20220330T140000Z
DTEND;VALUE=DATE-TIME:20220330T150000Z
DTSTAMP;VALUE=DATE-TIME:20230208T061547Z
UID:AnLy/7
DESCRIPTION:Title: Car
rollian fluids and Chthonian versus celestial holography\nby Marios Pe
tropoulos (Ecole Polytechnique\, CPHT) as part of AnLy Strings and Fields
online seminars\n\n\nAbstract\nThe usual approach of fluid/gravity corresp
ondence coincides with solving Einstein's equations in a generalized "inco
mplete Newman-Unti gauge". In this framework\, the asymptotic symmetry gro
up is bigger and accounts for the boundary-fluid hydrodynamic frame invari
ance. The latter pattern holds both for Einstein and Ricci-flat spacetimes
\, dual to relativistic and Carrollian fluids\, respectively. This is a co
ncrete starting point for approaching flat holography and understanding th
e role of the BMS group on the dual boundary theory. It suggests that the
latter might be non-local in order to account for the infinite Chthonian d
egrees of freedom\, as opposed to the celestial proposal.\n
LOCATION:https://researchseminars.org/talk/AnLy/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Joseph Conlon (Oxford U.)
DTSTART;VALUE=DATE-TIME:20220316T151500Z
DTEND;VALUE=DATE-TIME:20220316T161500Z
DTSTAMP;VALUE=DATE-TIME:20230208T061547Z
UID:AnLy/8
DESCRIPTION:Title: Hol
ographic Questions About Moduli Stabilisation\nby Joseph Conlon (Oxfor
d U.) as part of AnLy Strings and Fields online seminars\n\n\nAbstract\nMo
duli stabilisation is an important and fundamental question in string theo
ry as it is a precursor to constructing semi-realistic string vacua. I des
cribe work over the last few years aiming at examining moduli stabilised v
acua from a holographic perspective\, studying in particular LVS in IIB an
d DGKT in IIA. In scale separated limits of large volumes and weak couplin
g\, the conformal dimensions of dual operators approach fixed values that
are independent of fluxes and many other microscopic aspects of the constr
uctions. A further intriguing property is the existence of integer conform
al dimensions for DGKT vacua\, although the origin of these integers is my
sterious.\n
LOCATION:https://researchseminars.org/talk/AnLy/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gianguido Dall'Agata (Padua U.)
DTSTART;VALUE=DATE-TIME:20220413T140000Z
DTEND;VALUE=DATE-TIME:20220413T150000Z
DTSTAMP;VALUE=DATE-TIME:20230208T061547Z
UID:AnLy/9
DESCRIPTION:Title: Sup
ergravity and the weak gravity conjecture\nby Gianguido Dall'Agata (Pa
dua U.) as part of AnLy Strings and Fields online seminars\n\n\nAbstract\n
I will show how the weak gravity conjecture applied to 4-dimensional super
gravity theories can be very powerful in constraining which models can be
realistically obtained as low-energy effective theories of string theory.
In particular\, I will discuss how we can obtain rather general and strong
constraints on scale separation between the lower and higher dimensional
theory and how most models with positive energy critical points cannot hav
e a consistent string theory origin.\n
LOCATION:https://researchseminars.org/talk/AnLy/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Erik Plauschinn (Utrecht U.)
DTSTART;VALUE=DATE-TIME:20220511T140000Z
DTEND;VALUE=DATE-TIME:20220511T150000Z
DTSTAMP;VALUE=DATE-TIME:20230208T061547Z
UID:AnLy/10
DESCRIPTION:Title: Th
e tadpole conjecture in asymptotic limits\nby Erik Plauschinn (Utrecht
U.) as part of AnLy Strings and Fields online seminars\n\n\nAbstract\nSup
erstring theory is defined in ten space-time dimensions. In order to conne
ct it to physics in four dimensions one typically has to compactify the th
eory and satisfy a number consistency conditions. One of them is the tadpo
le cancellation condition. Recently\, Bena\, Blabäck\, Grana\, and Lüst
made a "tadpole conjecture" which - if true - would imply that many naivel
y-allowed (flux-)compactifications are inconsistent. \nIn the first part o
f the talk I will explain and illustrate the tadpole conjecture. In the se
cond part I present arguments towards a proof of the conjecture in asympto
tic limits using the framework of asymptotic Hodge theory.\n
LOCATION:https://researchseminars.org/talk/AnLy/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Romain Ruzziconi (TU Wien)
DTSTART;VALUE=DATE-TIME:20220525T140000Z
DTEND;VALUE=DATE-TIME:20220525T150000Z
DTSTAMP;VALUE=DATE-TIME:20230208T061547Z
UID:AnLy/11
DESCRIPTION:Title: A
Carrollian Perspective on Celestial Holography\nby Romain Ruzziconi (T
U Wien) as part of AnLy Strings and Fields online seminars\n\n\nAbstract\n
I will present a holographic description of gravity in 4d asymptotically f
lat spacetime in terms of a 3d sourced conformal Carrollian field theory.
The external sources encode the leaks of gravitational radiation at null i
nfinity. The Ward identities of this theory are shown to reproduce those o
f the 2d celestial CFT after relating Carrollian to celestial operators. T
his suggests a new set of interplays between gravity in asymptotically fla
t spacetime\, sourced conformal Carrollian field theory and celestial CFT.
\n\n\nBased on: https://arxiv.org/abs/2202.04702\n
LOCATION:https://researchseminars.org/talk/AnLy/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Michela Petrini (LPTHE Paris)
DTSTART;VALUE=DATE-TIME:20220608T140000Z
DTEND;VALUE=DATE-TIME:20220608T150000Z
DTSTAMP;VALUE=DATE-TIME:20230208T061547Z
UID:AnLy/12
DESCRIPTION:Title: A
systematic approach to consistent truncations\nby Michela Petrini (LPT
HE Paris) as part of AnLy Strings and Fields online seminars\n\n\nAbstract
\nIn this talk I will discuss how generalised geometry provides a systemat
ic way to construct and classify consistent truncations to different dimen
sions and with different amount of supersymmetry. As an example I will app
ly this formalism to the classification of N=2 gauged supergravity in 5 fi
ve dimensions that can be obtained as consistent truncations of type IIB o
r M theory.\n
LOCATION:https://researchseminars.org/talk/AnLy/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Oscar Loaiza-Brito (Guanajuato U.)
DTSTART;VALUE=DATE-TIME:20220622T140000Z
DTEND;VALUE=DATE-TIME:20220622T150000Z
DTSTAMP;VALUE=DATE-TIME:20230208T061547Z
UID:AnLy/13
DESCRIPTION:Title: Ad
S and dS vacua from torsion and non-BPS states\nby Oscar Loaiza-Brito
(Guanajuato U.) as part of AnLy Strings and Fields online seminars\n\n\nAb
stract\nWe look for minimal conditions to construct stable Anti de Sitter
and de Sitter vacua from type IIB String theory compactification on Kähle
r manifolds with torsion in the presence of O3-planes. This allows contrib
utions to the scalar potential from the five-form flux and from D5-branes
wrapping torsional cycles -interpreted as non-BPS states carrying discrete
Z_2 charge and classified by K-theory- which in turn leads to the constru
ction of AdS and dS vacua respectively. We shall discuss some constraints
on the configuration as well as possible sources of instabilities.\n
LOCATION:https://researchseminars.org/talk/AnLy/13/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Claude Duhr (Bonn U.)
DTSTART;VALUE=DATE-TIME:20221005T140000Z
DTEND;VALUE=DATE-TIME:20221005T150000Z
DTSTAMP;VALUE=DATE-TIME:20230208T061547Z
UID:AnLy/14
DESCRIPTION:Title: 2D
fishnet integrals and Calabi-Yau geometries\nby Claude Duhr (Bonn U.)
as part of AnLy Strings and Fields online seminars\n\n\nAbstract\nWe argu
e that Yangian-invariant l-loop fishnet integrals in 2 dimensions are clos
ely related to a family of Calabi-Yau l-folds. This allows us to reduce th
e computation of these integrals to the computation of the Calabi-Yau peri
ods. The periods are solutions of the Picard-Fuchs differential equations\
, which in turn are determined by the Yangian symmetry. Finally\, we show
that the values of these fishnet integrals admit a natural interpretation
as the quantum volume of the Calabi-Yau.\n
LOCATION:https://researchseminars.org/talk/AnLy/14/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jean-Luc Lehners (Postdam\, MPI)
DTSTART;VALUE=DATE-TIME:20221019T140000Z
DTEND;VALUE=DATE-TIME:20221019T150000Z
DTSTAMP;VALUE=DATE-TIME:20230208T061547Z
UID:AnLy/15
DESCRIPTION:Title: Ho
w to create universes with internal flux\nby Jean-Luc Lehners (Postdam
\, MPI) as part of AnLy Strings and Fields online seminars\n\n\nAbstract\n
String compactifications typically require fluxes\, for example in order t
o stabilise moduli. Such fluxes\, when they thread internal dimensions\, a
re topological in nature and take on quantised values. This poses the puzz
le as to how they could arise in the early universe\, as they cannot be tu
rned on incrementally. Working with string inspired models in 6 and 8 dime
nsions\, we show that there exist no-boundary solutions in which internal
fluxes are present from the creation of the universe onwards. The no-bound
ary proposal can thus explain the origin of fluxes in a Kaluza-Klein conte
xt. In fact\, it acts as a selection principle since no-boundary solutions
are only found to exist when the fluxes have the right magnitude to lead
to an effective potential that is positive and flat enough for accelerated
expansion. Within the range of selected fluxes\, the no-boundary wave fun
ction assigns higher probability to smaller values of flux. Our models ill
ustrate how cosmology can act as a filter on a landscape of possible highe
r-dimensional solutions.\n
LOCATION:https://researchseminars.org/talk/AnLy/15/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Shai Chester (Weizmann Inst.)
DTSTART;VALUE=DATE-TIME:20221109T150000Z
DTEND;VALUE=DATE-TIME:20221109T160000Z
DTSTAMP;VALUE=DATE-TIME:20230208T061547Z
UID:AnLy/16
DESCRIPTION:Title: Pu
re supergravity and the conformal bootstrap\nby Shai Chester (Weizmann
Inst.) as part of AnLy Strings and Fields online seminars\n\n\nAbstract\n
We consider graviton scattering in maximal supergravity on Anti-de Sitter
space (AdS) in d+1 dimensions for d=3\, 4\, and 6 with no extra compact sp
acetime factor. Holography suggests that this theory is dual to an exotic
maximally supersymmetric conformal field theory (CFT) in d dimensions whos
e only light single trace operator is the stress tensor. This contrasts wi
th more standard cases like Type IIB string theory on AdS_5x S^5 dual to N
=4 Super-Yang-Mills\, where the CFT has light single trace operators for e
ach Kaluza-Klein mode on S^5. We compute the 1-loop correction to the pure
AdS_{d+1} theory in a small Planck length expansion\, which is dual to th
e large central charge expansion in the CFT. We find that this correction
saturates the most general non-perturbative conformal bootstrap bounds on
this correlator in the large central charge regime for d=3\, 4\, 6. After
imposing theory-specific constraints from localization in d=3\, 4\, the bo
otstrap constraints strengthen and are then saturated by the string/M-theo
ry dual CFT data.\n
LOCATION:https://researchseminars.org/talk/AnLy/16/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bruno Valeixo Bento (U. Liverpool (main))
DTSTART;VALUE=DATE-TIME:20221123T150000Z
DTEND;VALUE=DATE-TIME:20221123T160000Z
DTSTAMP;VALUE=DATE-TIME:20230208T061547Z
UID:AnLy/17
DESCRIPTION:Title: Gr
avity at the Tip of the Throat\nby Bruno Valeixo Bento (U. Liverpool (
main)) as part of AnLy Strings and Fields online seminars\n\n\nAbstract\nW
arped throats have been used in countless works in the context of string t
heory compactifications\, in particular for their ability to suppress high
energy scales. I will focus on the gravitational sector of the resulting
4d EFT\, with its tower of Kaluza-Klein (KK) gravitons. By assuming that w
e live on a (3+1)-dimensional brane within the throat\, we can study how t
he warping influences the effects of this tower – in particular\, I will
show how the tower corrects the Newtonian potential and discuss how gravi
tational experiments and observations may be used to test the possibility
that our Universe corresponds to a brane living in a warped throat. I will
also briefly mention what this means for gravitational wave signatures o
riginating from different types of sources within this setup.\n
LOCATION:https://researchseminars.org/talk/AnLy/17/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thomas Van Riet (Leuven U.)
DTSTART;VALUE=DATE-TIME:20221214T150000Z
DTEND;VALUE=DATE-TIME:20221214T160000Z
DTSTAMP;VALUE=DATE-TIME:20230208T061547Z
UID:AnLy/18
DESCRIPTION:Title: A
supergravity view on a possible AdS1/CFT0 correspondence\nby Thomas Va
n Riet (Leuven U.) as part of AnLy Strings and Fields online seminars\n\n\
nAbstract\nTop down holography relies on a decoupling limit of closed and
open strings near the horizon of a stack of D branes. The simplest such ho
rizon geometries are of the form of an AdS space times a sphere times a to
rus with the total product space being a 10 or 11-dimensional solution of
supergravity. I will explain that this picture naturally leads one to cons
ider an extreme case which would be AdS1 x S1 x T9 and it would originate
from a brane bound state given by the so-called D7 -D instanton system\, w
hich is not fully understood in supergravity. I will point out that the du
al matrix model seems already written down in the literature before and it
is an extension of the IKKT matrix model. I will attempt to be pedagogica
l and the talk will mostly reflect the supergravity side of the problem.\n
LOCATION:https://researchseminars.org/talk/AnLy/18/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Eduardo Gonzalo-Badia (Lehigh U.)
DTSTART;VALUE=DATE-TIME:20230111T150000Z
DTEND;VALUE=DATE-TIME:20230111T160000Z
DTSTAMP;VALUE=DATE-TIME:20230208T061547Z
UID:AnLy/19
DESCRIPTION:Title: Ty
pe IIB flux compactifications with h^{1\,1} = 0\nby Eduardo Gonzalo-Ba
dia (Lehigh U.) as part of AnLy Strings and Fields online seminars\n\n\nAb
stract\nType IIB flux vacua based on Landau-Ginzburg models without Kähle
r deformations provide fully-controlled insights into the non-geometric an
d strongly-coupled string landscape. We show here that supersymmetric flux
configurations at the Fermat point of the 1^9 model\, which were found lo
ng-time ago to saturate the orientifold tadpole\, leave a number of massle
ss fields\, which however are not all flat directions of the superpotentia
l at higher order. More generally\, the rank of the Hessian of the superpo
tential is compatible with a suitably formulated tadpole conjecture for al
l fluxes that we found. Moreover\, we describe new infinite families of su
persymmetric 4d N = 1 Minkowski and AdS vacua and confront them with sever
al other swampland conjectures.\n
LOCATION:https://researchseminars.org/talk/AnLy/19/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Junho Hong (KU Leuven)
DTSTART;VALUE=DATE-TIME:20230125T150000Z
DTEND;VALUE=DATE-TIME:20230125T160000Z
DTSTAMP;VALUE=DATE-TIME:20230208T061547Z
UID:AnLy/20
DESCRIPTION:Title: La
rge N partition functions\, holography\, and black holes\nby Junho Hon
g (KU Leuven) as part of AnLy Strings and Fields online seminars\n\n\nAbst
ract\nIn this talk\, I will present a simple closed form expression for th
e topologically twisted index of the ABJM theory as a function of the magn
etic fluxes and complexified electric chemical potentials valid at fixed k
and to all orders in the large N expansion. These results have important
implications for holography and the microscopic entropy counting of supers
ymmetric static AdS4 black holes. I will also discuss the squashed sphere
partition function and the superconformal index of the ABJM theory in a si
milar context. Finally\, I will briefly comment on the generalization to o
ther N = 2 superconformal field theories.\n
LOCATION:https://researchseminars.org/talk/AnLy/20/
END:VEVENT
END:VCALENDAR