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Hamiltonian systems, symplectic flows, classical integrable systems
5
votes
Has anything precise been written about the Fukaya category and Lagrangian skeletons?
On this topic I've only seen Ganatra's notes from Paul's Talbot talk (see Scott's answer). An aspect of this, that a Fukaya category can behave in a sheafy way, is part of Nadler's proof that "microlo …
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( …
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 It was solved Vin de Silva in his (unpublished) D. Phil …
3
votes
Accepted
an extended question of Gromov: Every **generalized open almost complex manifold** admits a...
In his thesis
http://arxiv.org/abs/math/0401221
Marco Gualtieri explains that a generalized almost complex structure on an $n$-manifold $M$ is a reduction of the structure group of $TM \oplus T^\ast …
2
votes
Accepted
Spin-c Structures with Near-Symplectic Forms
When $(X,\omega)$ is a near-symplectic oriented 4-manifold there is always a canonical identification between $\mathrm{Spin}^c(X)$ and the classes in $H_2(X,Z;\mathbb{Z})$ that bound $[Z]$, where $Z=\ …
9
votes
Why is the base of SLAG fibration of CY3 expected to be $S^3$?
If your CY manifold is simply connected, the base of the torus-fibration will have to be simply connected too, since a homotopically non-trivial loop downstairs would lift to a loop upstairs which doe …
8
votes
Accepted
Why is Heegaard Floer Homology defined in terms of Sym$^g\Sigma_g$ instead of Pic$^g\Sigma_g$?
There is a tacit assumption behind this question, which I don't think is justified: that the Abel-Jacobi images of the Heegaard tori $\mathbb{T}_{\alpha}$ and $\mathbb{T}_{\beta}$ are Lagrangian with …
3
votes
SFT compactness
For non-specialist readers:
SFT = symplectic field theory
BEHWZ = Bourgeois-Eliashberg-Hofer-Wysocki-Zehnder, the authors of the paper which establishes the basic compactness theorem for pseudo-hol …
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 …
7
votes
contactomorphism of $S^{2n+1}$ for n>1
I know of no technique capable of bounding above the homotopy groups of a symplectomorphism group in dimension $\geq 6$, nor of a contactomorphism group in dimension $\geq 5$.
There are, however, te …
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
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 …
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 …
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 …
8
votes
Accepted
Length of Floer flow lines
In your symplectically aspherical setting, bounds on length will indeed exist.
Suppose one has a sequence of solutions $u_n$ to Floer's equation, of bounded energy, and a sequence of points $t_n\in …