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Hamiltonian systems, symplectic flows, classical integrable systems

16 votes
2 answers
2k views

Deformation quantization and quantum cohomology (or Fukaya category) -- are they related?

Good afternoon. Let $M$ be, say, a compact symplectic manifold. Both deformation quantization (as in Kontsevich) and quantum cohomology yield "deformations" (in the appropriate respective senses) of …
Kevin H. Lin's user avatar
11 votes
1 answer
2k views

"Fourier-Mukai" functors for Fukaya categories?

I just skimmed a bit of this fresh-off-the-press paper on homological mirror symmetry for general type varieties. One thing that intrigued me was statement (ii) of Conjecture 3.3. It suggests that, j …
Kevin H. Lin's user avatar
7 votes
2 answers
3k views

Different definitions of Novikov ring?

Following, e.g., Wikipedia's definitions, the (small) quantum cohomology ring of $X$ is defined over a "Novikov ring" consisting of formal power series of the form $$ \sum_{\beta \in H_2(X;\mathbb{Z}) …
Kevin H. Lin's user avatar
9 votes
2 answers
2k views

Are Fukaya categories Calabi-Yau categories?

Let X be a compact symplectic manifold. There is an idea, I think probably originally due to Kontsevich, that we should be able to get Gromov-Witten invariants of X out of the Fukaya category of X. On …
Kevin H. Lin's user avatar
15 votes
1 answer
3k views

Where does the Givental reconstruction formula come from?

In (for example) Semisimple Frobenius structures at higher genus (section 1.2) and Gromov-Witten invariants and quantization of quadratic Hamiltonians (section 6.8), Givental gives a conjectural formu …
Kevin H. Lin's user avatar
20 votes
1 answer
4k views

Hochschild (co)homology of Fukaya categories and (quantum) (co)homology

There is a conjecture of Kontsevich which states that Hochschild (co)homology of the Fukaya category of a compact symplectic manifold $X$ is the (co)homology of the manifold. (See page 18 of Kontsevic …
Kevin H. Lin's user avatar
4 votes
2 answers
751 views

Convergence of quantum cohomology

For which manifolds or varieties is quantum cohomology known to converge? Are there any manifolds for which quantum cohomology is known to not converge? I seem to have the impression that quantum coho …
Kevin H. Lin's user avatar
14 votes
4 answers
2k views

Negative Gromov-Witten invariants

I understand the heuristic reason why Gromov-Witten invariants can be rational; roughly it's because we're doing curve counts in some stacky sense, so each curve $C$ contributes $1/|\text{Aut}(C)|$ to …
Kevin H. Lin's user avatar
25 votes
4 answers
7k views

Is the Fukaya category "defined"?

Sometimes people say that the Fukaya category is "not yet defined" in general. What is meant by such a statement? (If it simplifies things, let's just stick with Fukaya categories of compact symplect …
Kevin H. Lin's user avatar
10 votes
5 answers
1k views

Compact Kaehler manifolds that are isomorphic as symplectic manifolds but not as complex man...

What are some examples of compact Kaehler manifolds (or smooth complex projective varieties) that are not isomorphic as complex manifolds (or as varieties), but are isomorphic as symplectic manifolds …
Kevin H. Lin's user avatar