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Hamiltonian systems, symplectic flows, classical integrable systems

3 votes
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Relation between symplectic (co)homology and Hochschild (co)homology and deformations

First, the closed-open string map is expected to be an isomorphism between BV algebras. In the case when $X$ is a Weinstein manifold, it is known to be an isomorphism of BV algebras, just make sure th …
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20 votes

What is so geometric about symplectic geometry?

I think a mainstream answer would be that symplectic geometry has two (seemingly opposiate, but actually related) aspects: rigidity and flexibility, it is the rigidity aspect that makes symplectic geo …
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1 vote
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Viterbo restriction map surjective on Weinstein neighbourhood

This is almost never true in general, although it's obviously true for boundary connected sums. For example, it is usually the case that Weinstein handle attachment will kill (non-trivial) invertible …
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2 votes
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Arithmetic symplectic geometry via mirror symmetry?

Yes. Recently Auroux (jointly with Efimov and Katzarkov) has proposed a definition of the Fukaya category for trivalent configurations of rational curves. If $\Sigma_g$ is a genus $g$ Riemann surface …
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5 votes

The mirror of the Landau--Ginzburg model given by elliptically fibered K3

In general, if $X$ is a compact smooth $n$-dimensional Calabi-Yau manifold, and $D\subset X$ is an ample (or numerically effective) divisor, then the mirror of $X$ is usually a degeneration of the mir …
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4 votes
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The singular cohomology embeds into the symplectic cohomology

There is a Morse-Bott spectral sequence computing the symplectic cohomology of affine varieties which are complements of normal crossing divisors in smooth projective varieties. For simplicity, let's …
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5 votes

Mirror symmetry for blowups of the projective plane

It depends on the positions of the points that you blow up. If you blow up respectively $p,q$ and $r$ points on the 3 irreducible components of the toric divisor $D\subset\mathbb{CP}^2$, with $p,q,r\g …
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2 votes
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Describing a Lefschetz fibration whose fiber is plumbing of $T^*S^n$

Yes, it's possible for the specific case that you are looking at. For $k=1$, this is obvious. For $k\geq2$, such a Lefschetz fibration can be constructed by applying a standard construction to the sta …
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5 votes
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How to construct the mirror partner of a blowup?

You can find a lot of such examples in the paper of Abouzaid-Auroux-Katzarkov: https://link.springer.com/article/10.1007/s10240-016-0081-9. Basically, they studied the case when $X$ is $(\mathbb{C}^\ …
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3 votes
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Does there exists a Fukaya category with no objects

Let's assume that $M$ is an $n$-dimensional exact symplectic manifold and we are only interested in Fukaya categories of closed exact Lagrangian submanifolds. Then for any subcritical Weinstein manifo …
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1 vote

Gluing symplectic manifolds

$S^3$ as a boundary cannot be both convex and concave. This is proved in the famous paper of Eliashberg-Gromov.
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2 votes

What is the relation between holomorphic blow-up and symplectic blow-up?

In the case when you are blowing up a smooth submanifold this actually coincides with the symplectic blow-up (with the symplectic form forgotten). For simplicity, let's take the submanifold to be a po …
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10 votes

What is the mirror of symplectic field theory?

A partial answer is as follows. In order to make use of the theory of holomorphic curves (with boundaries or asymptotics, whatever), we should restrict ourselves to symplectic manifolds with convex b …
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5 votes

Integral points - monotone symplectic toric manifolds

The geometric interpretation is quite simple: there is a unique torus fiber $L\subset M$ of the moment map $\mu:M\rightarrow\Delta_M$ which is monotone, and this fiber lies over the unique integral po …
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5 votes

$dd^\mathbb{C}$-lemma on pair $(X,D)$

If you take away $D$, then $X\setminus D$ is a non-compact complex manifold, so $\partial\bar{\partial}$-lemma in general does not hold in this case. However, by the work of Bott-Chern in 1965, for an …
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