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Hamiltonian systems, symplectic flows, classical integrable systems
25
votes
Accepted
Can cotangent bundles see exotic smooth structures?
I wrote a little expository piece about this and related matters in the Newsletter of the European Mathematical Society:
http://www.ems-ph.org/journals/newsletter/pdf/2010-03-75.pdf
The classical to …
24
votes
Accepted
What is the Poincare dual of a symplectic form?
One of the big advances in symplectic topology in the 90s was Donaldson's theorem that when the symplectic class is integral, high multiples of its dual are represented by symplectic submanifolds.
T …
23
votes
Accepted
Hochschild (co)homology of Fukaya categories and (quantum) (co)homology
The statement that $HF^{\ast}(X,X)$ is isomorphic to $QH^\ast(X)$ is a version of the Piunikhin-Salamon-Schwarz (PSS) isomorphism (proved, under certain assumptions, in McDuff-Salamon's book "J-holomo …
23
votes
Accepted
Floer homology and status of the Arnold conjecture
V. I. Arnol'd, June 12, 1937 - June 3, 2010.
The very sad news of his death is reported today here.
After Floer, the main difficulty in solving the weak Arnol'd conjecture on a compact symplectic ma …
20
votes
When are two symplectic forms "isotopic"?
There is a cheap way to find cohomologous but non-isotopic (in fact, non-deformation equivalent) symplectic forms: start with a symplectic manifold and pull back the symplectic form via a diffeomorphi …
19
votes
Accepted
Morse theory in infinite dimensions
The first case has finite indices and parabolic gradient flow; the second infinite (co)indices and elliptic gradient flow.
In more detail, the Morse theory of the energy functional $E$ on $X:=\Omega( …
14
votes
Accepted
Kuranishi structures vs polyfolds
Kuranishi models are a traditional - and beautiful - technique for describing the local structure of moduli spaces cut out by non-linear equations whose linearization is Fredholm. A more elaborate ver …
14
votes
Accepted
Obstruction bundle for spaces with Kuranishi structure
Here's a view of the symplectic side of the bridge.
The Kuranishi model (see Donaldson-Kronheimer, The geometry of four-manifolds, ch. 4) goes like this. You're interested in a (moduli) space $M$ cut …
13
votes
Accepted
Mirror to the dualizing sheaf
I'll comment on the related question "what is the Serre functor for the Fukaya category?"
Calabi-Yau setting
The Serre functor $S$, by definition, satisfies $\mathsf{Hom}(X,SY) \cong \mathsf{Hom}(Y …
13
votes
Accepted
"Fourier-Mukai" functors for Fukaya categories?
I can't speak for these authors, but what I understand by a "Fourier-Mukai" transform between Fukaya categories is the functor between extended Fukaya categories associated with a Lagrangian correspon …
12
votes
Accepted
Where are $+$, $-$ and $\infty$ in bordered Heegaard-Floer theory?
A biased answer, based on Auroux's work http://arxiv.org/abs/1003.2962.
Auroux makes a connection between bordered Floer theory and an alternative approach, due to Lekili and myself, which is (still …
11
votes
Accepted
Orientations for pseudoholomorphic curves with totally real boundary condition
1) The problem of orienting moduli spaces of pseudo-holomorphic discs with totally real boundary conditions is really a problem in index theory. It was solved Vin de Silva in his (unpublished) D. Phil …
11
votes
Accepted
symplectic 4-manifolds with free circle action
Here's an example, using a construction of Fernandez, Gray and Morgan (1991):
Take a closed surface $S$ with area form $\omega$, let $\phi$ be an area-preserving diffeomorphism, and $p\colon S_\phi …
11
votes
Real interpretations of Discontinuities in Floer homology
The brief answer is yes, using ideas from Novikov homology.
Here's an example of the discontinuity and how it can be fixed. Take $L=S^1\times y$ as a Lagrangian in standard symplectic $T^2=S^1\time …
11
votes
Accepted
How to relate equivariant symplectic cohomology, Contact Homology, Cyclic Homology and Strin...
Some blah on symplectic homology vs. cohomology. There's an invariant $SH(M)$ of Liouville domains $M$ which some people call symplectic homology and some symplectic cohomology. This is the direct lim …