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BEGIN:VEVENT
SUMMARY:Complex cobordism and loops of Hamiltonians
DTSTART:20220704T140000Z
DTEND:20220704T150000Z
DTSTAMP:20231005T030100Z
UID:indico-contribution-6824@indico.math.cnrs.fr
DESCRIPTION:Speakers: Mohammed Abouzaid (Columbia University)\n\nI will de
scribe joint work with McLean and Smith showing that loops of Hamiltonians
are trivial from the point of view of complex cobordism. The proof is a s
urprising application of Floer homology theory\, and of abstract results i
n chromatic homotopy theory.\n\nhttps://indico.math.cnrs.fr/event/5788/con
tributions/6824/
LOCATION:Amphithéâtre Hermite (Institut Henri Poincaré)
URL:https://indico.math.cnrs.fr/event/5788/contributions/6824/
END:VEVENT
BEGIN:VEVENT
SUMMARY:New constructions of symplectomorphisms
DTSTART:20220705T073000Z
DTEND:20220705T083000Z
DTSTAMP:20231005T030100Z
UID:indico-contribution-6832@indico.math.cnrs.fr
DESCRIPTION:Speakers: Ailsa Keating (University of Cambridge)\n\nWe introd
uce two new constructions of compactly supported symplectomorphisms of Wei
nstein 4-manifolds: `Lagrangian translations' and `nodal slide recombinati
ons'. These are natural from the perspective of mirror symmetry. After an
overview of the constructions and their properties\, the talk will focus o
n describing the maps in the first non-trivial cases. Joint work with Paul
Hacking.\n\nhttps://indico.math.cnrs.fr/event/5788/contributions/6832/
LOCATION:Amphithéâtre Hermite (Institut Henri Poincaré)
URL:https://indico.math.cnrs.fr/event/5788/contributions/6832/
END:VEVENT
BEGIN:VEVENT
SUMMARY:K-theoretic aspects of the nearby Lagrangian conjecture
DTSTART:20220705T090000Z
DTEND:20220705T100000Z
DTSTAMP:20231005T030100Z
UID:indico-contribution-6826@indico.math.cnrs.fr
DESCRIPTION:Speakers: Daniel Álvarez-Gavela (MIT)\n\nIt was recently show
n by M. Abouzaid\, S. Courte\, S. Guillermou and T. Kragh that every nearb
y Lagrangian admits a so-called twisted generating function of tube type\,
thereby establishing a connection between the nearby Lagrangian conjectur
e and Waldhausen's algebraic K-theory of spaces. I will discuss several as
pects of this connection\, including a joint work in progress with M. Abou
zaid\, S. Courte and T. Kragh which finds new restrictions on the smooth s
tructure of nearby Lagrangians.\n\nhttps://indico.math.cnrs.fr/event/5788/
contributions/6826/
LOCATION:Amphithéâtre Hermite (Institut Henri Poincaré)
URL:https://indico.math.cnrs.fr/event/5788/contributions/6826/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Persistence K-theory
DTSTART:20220708T123000Z
DTEND:20220708T133000Z
DTSTAMP:20231005T030100Z
UID:indico-contribution-6839@indico.math.cnrs.fr
DESCRIPTION:Speakers: Paul Biran (ETH Zürich)\n\nK-theory\, in its classi
cal form\, associates to a triangulated category an abelian group called t
he K-group (or the Grothendieck group). Important invariants of various tr
iangulated\ncategories are known to factor through their K-groups.\n\nIn t
his talk we will explain the foundations of persistence K-theory\, which i
s an analogous theory for triangulated persistence categories. In particul
ar we will introduce new persistence measurements coming from these K-grou
ps\, and new invariants coming from the combination of the persistence and
triangulated structures.\n\nIn the last part of the talk we will exemplif
y this new theory on the case of the persistence Fukaya category of Lagran
gian submanifolds. In particular we will show how our invariants can disti
nguish between modules that can represent embedded Lagrangians and those w
ho can\nrepresent only immersed ones.\n\nBased on joint work with Octav Co
rnea and Jun Zhang.\n\nhttps://indico.math.cnrs.fr/event/5788/contribution
s/6839/
LOCATION:Amphithéâtre Hermite (Institut Henri Poincaré)
URL:https://indico.math.cnrs.fr/event/5788/contributions/6839/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Floer homology for singular lagrangians and homological mirror sym
metry of CP^n
DTSTART:20220706T090000Z
DTEND:20220706T100000Z
DTSTAMP:20231005T030100Z
UID:indico-contribution-6830@indico.math.cnrs.fr
DESCRIPTION:Speakers: Paolo Ghiggini (Nantes Université)\n\nI will explai
n how to define a version of Floer homology for Lagrangians with conical s
ingularities and how\, in good situations\, this construction leads to the
definition of localised mirror functors which generalise those of Cho-Hon
g-Lau. Then I will apply this construction to find the mirror of the pair
(CP^n\, D) where D={x_0=0} \\cup {x_1...x_n=x_0^n }. This is a joint work
in progress with Georgios Dimitroglou Rizell.\n\nhttps://indico.math.cnrs.
fr/event/5788/contributions/6830/
LOCATION:Amphithéâtre Hermite (Institut Henri Poincaré)
URL:https://indico.math.cnrs.fr/event/5788/contributions/6830/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Localization and flexibilization in symplectic geometry
DTSTART:20220708T090000Z
DTEND:20220708T100000Z
DTSTAMP:20231005T030100Z
UID:indico-contribution-6838@indico.math.cnrs.fr
DESCRIPTION:Speakers: Oleg Lazarev (University of Massachusetts Boston)\n\
nLocalization is an important construction in algebra and topology that a
llows one to study global phenomena a single prime at a time. Flexibiliza
tion is an operation in symplectic topology introduced by Cieliebak and E
liashberg that makes any two symplectic manifolds that are diffeomorphic (
plus a bit of tangent bundle data) become symplectomorphic. In this t
alk\, I will explain that it is fruitful to view flexibilization as a l
ocalization (away from zero ). Building on work of Abouzaid and Seidel\,
l will also give examples of new localization functors of symplectic man
ifolds (up to stabilization and subcriticals) that interpolate between fle
xible and rigid symplectic geometry and can be viewed as symplectic analog
s of topological localization of Sullivan\, Quillen\, and Bousfield. \n
This talk is based on joint work with Z. Sylvan and H. Tanaka.\n\nhttps://
indico.math.cnrs.fr/event/5788/contributions/6838/
LOCATION:Amphithéâtre Hermite (Institut Henri Poincaré)
URL:https://indico.math.cnrs.fr/event/5788/contributions/6838/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Limits in Donaldson-Auroux theory
DTSTART:20220704T123000Z
DTEND:20220704T133000Z
DTSTAMP:20231005T030100Z
UID:indico-contribution-6823@indico.math.cnrs.fr
DESCRIPTION:Speakers: Jean-Paul Mohsen (Aix-Marseille Université)\n\nIn t
he mid-90's\, Donaldson has introduced asymptotically holomorphic techniqu
es in symplectic geometry. In this talk\, I will discuss some applications
of Donaldson's construction and I will present a reformulation of the res
ults. The (renormalized) limits are the main tool in this reformulation.\n
\nhttps://indico.math.cnrs.fr/event/5788/contributions/6823/
LOCATION:Amphithéâtre Hermite (Institut Henri Poincaré)
URL:https://indico.math.cnrs.fr/event/5788/contributions/6823/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Almost all Reeb vector fields admit a Birkhoff section
DTSTART:20220705T123000Z
DTEND:20220705T133000Z
DTSTAMP:20231005T030100Z
UID:indico-contribution-6827@indico.math.cnrs.fr
DESCRIPTION:Speakers: Ana Rechtman (Université de Strasbourg)\n\nA Birkho
ff section reduces the study of a non-singular flow in 3D to that of a sur
face diffeomorphism and provides a rational open book carrying the flow. I
will present a recent existence statement for Birkhoff sections: the set
of a Reeb vector fields on closed 3-manifolds that admit a Birkhoff sect
ion contains an open and dense subset in the $C^\\infty$ topology. This co
nstruction is based on the existence of broken book decompositions and is
part of a joint work with Vincent Colin\, Pierre Dehornoy and Umberto Hryn
iewicz.\n\nhttps://indico.math.cnrs.fr/event/5788/contributions/6827/
LOCATION:Amphithéâtre Hermite (Institut Henri Poincaré)
URL:https://indico.math.cnrs.fr/event/5788/contributions/6827/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Foulon-Hasselblatt contact surgery and orbit growth of Reeb flows
DTSTART:20220706T123000Z
DTEND:20220706T133000Z
DTSTAMP:20231005T030100Z
UID:indico-contribution-6831@indico.math.cnrs.fr
DESCRIPTION:Speakers: Anne Vaugon (Université Paris-Saclay)\n\nThis talk
will focus on dynamical properties of Reeb vector fields after a Legendria
n surgery. Our description of the surgery was originally conceived by Foul
on and Hasselblatt as a source of Anosov Reeb flows on various 3-manifolds
including hyperbolic examples. I will explain that this operation often i
ncreases the complexity of Reeb flows by studying their orbit growths. Thi
s talk is based on joint works with B. Hasselblatt and P. Foulon and with
S. Tapie.\n\nhttps://indico.math.cnrs.fr/event/5788/contributions/6831/
LOCATION:Amphithéâtre Hermite (Institut Henri Poincaré)
URL:https://indico.math.cnrs.fr/event/5788/contributions/6831/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Reverse Lagrangian surgery on fillings
DTSTART:20220708T073000Z
DTEND:20220708T083000Z
DTSTAMP:20231005T030100Z
UID:indico-contribution-6837@indico.math.cnrs.fr
DESCRIPTION:Speakers: Yu Pan (Tianjin University)\n\nFor an immersed filli
ng of a topological knot\, one can do surgery to resolve a double point wi
th the price of increasing surface genus by 1. In the Lagrangian analog\,
one can do Lagrangian surgery on immersed Lagrangian fillings to treat a d
ouble point by a genus. In this talk\, we will show that not all Lagrangia
n surgeries are reversible. Moreover\, there are surgeries that can not be
reversed in the Lagrangian world but are potentially able to be reverse
d in the smooth world.\n\nhttps://indico.math.cnrs.fr/event/5788/contribut
ions/6837/
LOCATION:Amphithéâtre Hermite (Institut Henri Poincaré)
URL:https://indico.math.cnrs.fr/event/5788/contributions/6837/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Singular plane curves and stable nonsqueezing phenomena
DTSTART:20220705T140000Z
DTEND:20220705T150000Z
DTSTAMP:20231005T030100Z
UID:indico-contribution-6828@indico.math.cnrs.fr
DESCRIPTION:Speakers: Kyler Siegel (University of Southern California)\n\n
The existence of rational plane curves of a given degree with prescribed s
ingularities is a subtle and active area in algebraic geometry. This quest
ion turns out to be closely related to difficult enumerative problems whic
h arise in symplectic field theory\, and which in turn play a key role in
the theory of high dimensional symplectic embeddings. In this talk I will
discuss various perspectives on these enumerative problems and how recent
advances on the symplectic side can give insight into the theory of singul
ar curves and vice versa.\n\nhttps://indico.math.cnrs.fr/event/5788/contri
butions/6828/
LOCATION:Amphithéâtre Hermite (Institut Henri Poincaré)
URL:https://indico.math.cnrs.fr/event/5788/contributions/6828/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A h-principle for conformal symplectic structures
DTSTART:20220704T090000Z
DTEND:20220704T100000Z
DTSTAMP:20231005T030100Z
UID:indico-contribution-6822@indico.math.cnrs.fr
DESCRIPTION:Speakers: Mélanie Bertelson (Université Libre de Bruxelles)\
n\nAny non-degenerate $2$-form can be homotoped to a locally conformal sym
plectic structure whose Lee form can be chosen to be any non-vanishing cl
osed $1$-form. Each component of the boundary can be chosen to be concave
or convex and to inherit a given overtwisted contact structure. On the oth
er hand\, for codimension one foliations\, a leafwise conformal symplectic
structure whose Lee form coincides with the holonomy $1$-form yields a co
ntact structure. Unfortunately\, the h-principle described above does not
admit a foliated version unless the ambient manifold has a non-empty bound
ary. This is a joint work with Gaël Meigniez.\n\nhttps://indico.math.cnrs
.fr/event/5788/contributions/6822/
LOCATION:Amphithéâtre Hermite (Institut Henri Poincaré)
URL:https://indico.math.cnrs.fr/event/5788/contributions/6822/
END:VEVENT
BEGIN:VEVENT
SUMMARY:SFT-style Rabinowitz complex for exact Lagrangian cobordisms and C
alabi-Yau isomorphism
DTSTART:20220707T090000Z
DTEND:20220707T100000Z
DTSTAMP:20231005T030100Z
UID:indico-contribution-6834@indico.math.cnrs.fr
DESCRIPTION:Speakers: Noémie Legout (Uppsala University)\n\nWe will defin
e a Floer complex (the "Rabinowitz" complex) associated to a pair of exact
Lagrangian cobordisms\, using SFT techniques. This complex is a DG-bimodu
le over the Chekanov-Eliashberg algebras of the Legendrian submanifolds in
the negative end of the cobordisms. We will use this complex and its prop
erties to show that the Chekanov-Eliashberg algebra of an horizontally dis
placeable Legendrian sphere satisfies some Calabi-Yau property\, namely th
at it is quasi-isomorphic as a DG-bimodule over itself to its inverse dual
izing bimodule.\n\nhttps://indico.math.cnrs.fr/event/5788/contributions/68
34/
LOCATION:Amphithéâtre Hermite (Institut Henri Poincaré)
URL:https://indico.math.cnrs.fr/event/5788/contributions/6834/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Contact convexity from Giroux to Honda-Huang
DTSTART:20220704T073000Z
DTEND:20220704T083000Z
DTSTAMP:20231005T030100Z
UID:indico-contribution-6784@indico.math.cnrs.fr
DESCRIPTION:Speakers: Yakov Eliashberg (Stanford university)\n\nContact co
nvexity theory which was pioneered 30 years ago by Emmanuel Giroux played
and continue to play an important role in contact and symplectic geometry.
\nMore recently\, Ko Honda and Yang Huang discovered new surprising flexib
ility phenomena in the high dimensional contact convexity.\nIn the talk I
will discuss a simplified approach (joint with Dishant Pancholi) to Honda
-Huang’s results.\n\nhttps://indico.math.cnrs.fr/event/5788/contribution
s/6784/
LOCATION:Amphithéâtre Hermite (Institut Henri Poincaré)
URL:https://indico.math.cnrs.fr/event/5788/contributions/6784/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Contact structures and open book decompositions
DTSTART:20220707T140000Z
DTEND:20220707T150000Z
DTSTAMP:20231005T030100Z
UID:indico-contribution-6836@indico.math.cnrs.fr
DESCRIPTION:Speakers: Ko Honda (University of California\, Los Angeles)\n\
nAround twenty years ago Emmanuel Giroux formulated the equivalence of con
tact structures and open book decompositions with Weinstein pages up to st
abilization. We revisit this equivalence through the lens of more recent
developments in convex hypersurface theory.\nThis is joint work with Joe B
reen and Yang Huang.\n\nhttps://indico.math.cnrs.fr/event/5788/contributio
ns/6836/
LOCATION:Amphithéâtre Hermite (Institut Henri Poincaré)
URL:https://indico.math.cnrs.fr/event/5788/contributions/6836/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Area-preserving homeomorphisms and link spectral invariants
DTSTART:20220706T140000Z
DTEND:20220706T150000Z
DTSTAMP:20231005T030100Z
UID:indico-contribution-6825@indico.math.cnrs.fr
DESCRIPTION:Speakers: Ivan Smith (University of Cambridge)\n\nWe will disc
uss various results concerning the algebraic structure of the group of are
a-preserving homeomorphisms of a compact surface. The results are obtained
from the asymptotics of spectral invariants associated to configurations
of disjoint circles on the surface. These link spectral invariants are in
turn defined from the Floer cohomology of an associated Lagrangian in the
symmetric product. This talk reports on joint work with Dan Cristofaro-Gar
diner\, Vincent Humilière\, Cheuk-Yu Mak and Sobhan Seyfaddini.\n\nhttps:
//indico.math.cnrs.fr/event/5788/contributions/6825/
LOCATION:Amphithéâtre Hermite (Institut Henri Poincaré)
URL:https://indico.math.cnrs.fr/event/5788/contributions/6825/
END:VEVENT
BEGIN:VEVENT
SUMMARY:ECH capacities and fractals of infinite staircases of 4D symplecti
c embeddings
DTSTART:20220707T123000Z
DTEND:20220707T133000Z
DTSTAMP:20231005T030100Z
UID:indico-contribution-6835@indico.math.cnrs.fr
DESCRIPTION:Speakers: Morgan Weiler (Cornell university)\n\nThe ellipsoid
embedding function of a symplectic manifold measures the amount by which t
he symplectic form must be scaled in order to fit an ellipsoid of a given
eccentricity. It generalizes the Gromov width and ball packing numbers. In
2012 McDuff and Schlenk computed the ellipsoid embedding function of the
ball\, showing that it exhibits a delicate piecewise linear pattern known
as an infinite staircase. Since then\, the embedding function of many othe
r symplectic four-manifolds have been studied\, and not all have infinite
staircases. We will classify those symplectic Hirzebruch surfaces whose em
bedding functions have an infinite staircase\, and explain how our work pr
ovides a blueprint for other targets. Based on work with Magill and McDuff
and work in progress with Magill and Pires.\n\nhttps://indico.math.cnrs.f
r/event/5788/contributions/6835/
LOCATION:Amphithéâtre Hermite (Institut Henri Poincaré)
URL:https://indico.math.cnrs.fr/event/5788/contributions/6835/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Reception at ENS
DTSTART:20220706T160000Z
DTEND:20220706T180000Z
DTSTAMP:20231005T030100Z
UID:indico-contribution-7122@indico.math.cnrs.fr
DESCRIPTION:https://indico.math.cnrs.fr/event/5788/contributions/7122/
LOCATION:ENS
URL:https://indico.math.cnrs.fr/event/5788/contributions/7122/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Surfaces in smooth 4-manifolds
DTSTART:20220706T073000Z
DTEND:20220706T083000Z
DTSTAMP:20231005T030100Z
UID:indico-contribution-6829@indico.math.cnrs.fr
DESCRIPTION:Speakers: András Stipsicz (Renyi institute)\n\nAfter reviewin
g methods for constructing exotic smooth structures on closed four-manifol
ds\, we examine the ‘genus-function’ on the second homology\, and ask/
answer some questions related to this function. We extend the notion to ma
nifolds with boundary\, where the surfaces are bounded by knots or links i
n the boundary. We examine the relevance of these notions for the Smooth F
our-dimensional Poincare Conjecture.\n\nhttps://indico.math.cnrs.fr/event/
5788/contributions/6829/
LOCATION:Amphithéâtre Hermite (Institut Henri Poincaré)
URL:https://indico.math.cnrs.fr/event/5788/contributions/6829/
END:VEVENT
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