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Hamiltonian systems, symplectic flows, classical integrable systems

6 votes

Introduction to Floer Theory?

I wholeheartedly agree with both of Chris Gerig's suggestions. The small McDuff-Salamon book on holomorphic curves ("J-holomorphic curves and quantum cohomology", available on McDuff's webpage) has a …
Martin Sleziak's user avatar
4 votes
Accepted

Path of almost complex structure in the definition of Heegaard Floer homology

According to Proposition 3.9 of Ozsvath and Szabo's original paper "Holomorphic disks and topological invariants for closed three-manifolds" there are indeed topological conditions one can put on the …
LSpice's user avatar
  • 12.9k
7 votes

Simple examples of Gromov-Witten invariants not being enumerative

I'm not sure if this is quite what you're looking for, but I always found it a useful example to keep in mind. Take the genus 1 invariant for degree 1 maps into $P^1$. There are no degree 1 holomorphi …
Jonny Evans's user avatar
  • 7,005
1 vote

Why are symplectic toric varieties projective?

Not a full answer, but a partial answer to your question 1a. Torus-invariant Kaehler metrics (in particular complex structures) were constructed by Guillemin, just starting with data on the moment pol …
Jonny Evans's user avatar
  • 7,005
2 votes
Accepted

Could this be a Hamiltonian symplectomorphism on a symplectic toric manifold

Sometimes it is, sometimes it isn't. The spheres living over the edges generate the second homology, so you can read off the action on $H_2$ from that. For $S^2\times S^2$ (square) the action on homol …
Jonny Evans's user avatar
  • 7,005
5 votes

Infinity local systems

Since you tagged this with "symplectic geometry", I'm going to give an answer from a symplectic geometry perspective, which may not be what you're looking for, but (as a symplectic person) I find it i …
Jonny Evans's user avatar
  • 7,005
5 votes
Accepted

Progress on composition of Lagrangian correspondences/definition of symplectic categories?

Though not about solving the nontransversality problem, Fukaya's paper Unobstructed immersed Lagrangian correspondence and filtered A infinity functor is the state of the art in why nontransversality …
LSpice's user avatar
  • 12.9k
5 votes
Accepted

Question on Gromov-Witten invariants when $A=0$

In this case, the J-holomorphic curves are all constant, so the evaluation pseudocycle is the tridiagonal $\{(x,x,x) : x\in M\}$. You take cycles $A_1,A_2,A_3$ Poincare dual to $a_1,a_2,a_3$ respectiv …
Jonny Evans's user avatar
  • 7,005
5 votes
Accepted

Almost toric mutations

Mutation doesn't even change the integral affine base, which is why it doesn't change the symplectic manifold. All you're doing is changing the way the integral affine base is drawn. If you're given a …
Jonny Evans's user avatar
  • 7,005
26 votes

Has anything precise been written about the Fukaya category and Lagrangian skeletons?

I noticed this question has been bumped up to the front page, and the most recent answer is about 8 years old: the subject has moved on since then, and more has been written. Here is my understanding …
Martin Sleziak's user avatar
3 votes

From Delzant polytope to lattice polytope

If you have a lattice polytope then you get a projective toric variety. If your polytope is not a lattice polytope then you can still construct a symplectic toric manifold (e.g. by performing symplect …
Jonny Evans's user avatar
  • 7,005
0 votes
Accepted

Maslov index equal to $2$ implies that the disk is not multiply covered

First, I assume you want $w$ to be holomorphic (or else it isn't true). If the target is really $S^2$ with boundary on the equator $L$ then this should be easy to prove directly. Take a point $p$ not …
Jonny Evans's user avatar
  • 7,005
4 votes
Accepted

$\mathbb{R}\mathbb{P}^n$ is monotone in $\mathbb{C}\mathbb{P}^n$, Lagrangian floer cohomology

The relative homology long exact sequence puts this group in between $H_2(\mathbb{CP}^n)=\mathbb{Z}$ and $\mathbb{Z}/2$. It maps surjectively to $\mathbb{Z}/2$. Let D be a generator for relative homol …
Jonny Evans's user avatar
  • 7,005
8 votes
Accepted

Cotangent bundles of surfaces as varieties

This is not possible. There is something called the growth rate of symplectic cohomology which is subexponential for affine varieties and exponential for cotangent bundles of higher genus surfaces (am …
Jonny Evans's user avatar
  • 7,005
2 votes
Accepted

Boundary Maslov index of holomorphic disks in Calabi-Yau manifolds

I assume you're asking about embedded or at least immersed discs, in order to make sense of the normal bundle. If so, let's fix an immersion $\iota\colon\Sigma\to M$ and observe that the pullback bund …
Jonny Evans's user avatar
  • 7,005

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