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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 …
Tim Perutz's user avatar
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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 …
Tim Perutz's user avatar
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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 …
Tim Perutz's user avatar
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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 …
Tim Perutz's user avatar
  • 13.2k
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 …
Tim Perutz's user avatar
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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( …
Tim Perutz's user avatar
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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 …
Tim Perutz's user avatar
  • 13.2k
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 …
Tim Perutz's user avatar
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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 …
Tim Perutz's user avatar
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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 …
Tim Perutz's user avatar
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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 …
Tim Perutz's user avatar
  • 13.2k
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 …
Tim Perutz's user avatar
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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 …
Tim Perutz's user avatar
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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 …
Tim Perutz's user avatar
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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 …
Tim Perutz's user avatar
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