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Hamiltonian systems, symplectic flows, classical integrable systems

2 votes
Accepted

Is a simple J-holomorphic curve injective everywhere except for finitely many points?

Yes it must be proved in that same book, or any/every basic book, going back to the fundamental proof by Micallef--White: The critical points and the self-intersection points are isolated, as there is …
Chris Gerig's user avatar
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10 votes

Introduction to Floer Theory?

Michael Hutchings' lecture notes were precisely for this purpose; posted on his webpage: https://math.berkeley.edu/~hutching/ Lecture Notes on Morse Homology (With an Eye Towards Floer Theory and Pseu …
Martin Sleziak's user avatar
2 votes

In what topology does Gromov's lemma hold on noncompact symplectic manifolds?

Compact-open smooth topology, i.e. $C^\infty_\text{loc}$-topology, also the Fréchet topology on sections of the tangent bundle (same for Riemannian metrics). See some textbooks on J-holomorphic curves …
Chris Gerig's user avatar
  • 17.5k
2 votes

Dismissing pseudoholomorphic curves in embedded contact homology

(1) It cannot necessarily be done in general as you suggest, because you don’t have control over the “other Reeb orbits” so there are a priori bad curves that can hit them. It does however work on som …
Chris Gerig's user avatar
  • 17.5k
6 votes
Accepted

Positive-dimensional Seiberg-Witten moduli spaces

Exercise: The non-symplectic $K3\#n(S^1\times S^3)$ for $n>0$ with the spin-c structure induced from the canonical one on $K3$; it will have $n$-dimensional SW moduli. If you want symplectic examples: …
Chris Gerig's user avatar
  • 17.5k
2 votes
Accepted

Compactness as a consequence of the adjunction formula for genus second homology class

Assume your 4-manifold is minimal (otherwise there are multiply covered exceptional spheres which potentially give noncompactness). Then it's a computational check to see that: If $d(\alpha)=0$ with $ …
Chris Gerig's user avatar
  • 17.5k
12 votes

Why is embedded contact homology so powerful?

Without elaborating much there are three key points, with the first two laying the bedrock for the third: ECH counts J-curves without caring about most information of the actual branched covers of su …
Chris Gerig's user avatar
  • 17.5k
31 votes
Accepted

Is a symplectic camel actually prohibited from passing through the eye of a needle?

Eliashberg & Gromov sketched a proof in their paper "Convex symplectic manifolds" (Section 3.4). Written in the 4-dimensional case it says: For $r>0$ define the subspace $X(r)\subset\mathbb{R}^4$ to …
Chris Gerig's user avatar
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4 votes
Accepted

Bubbling off of a pseudo holomorphic sphere on surface with cylindrical ends

It turns out that the Removable Singularities Theorem and the Monotonicity Lemma do not require compactness, but that the target manifold should have bounded geometry, such as in our case of inserting …
Chris Gerig's user avatar
  • 17.5k
6 votes
Accepted

Casson invariant and Euler characteristic

Just to finalize comments since people are upvoting the question: The canonical reference is Taubes' "Casson's invariant and gauge theory" which makes the statement rigorous and has all the definition …
Chris Gerig's user avatar
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10 votes
Accepted

Example of two exotic closed 4-manifolds s.t. SW(X)=0

$\mathbb CP^2\#\overline{K3}$ (trivial SW because it is a connected sum with $b^2_+>0$ for both pieces). This is an example without having to use the Bauer-Furuta invariants (contrast with Kyle's comm …
Chris Gerig's user avatar
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4 votes
Accepted

Gromov-Witten invariants and the mod 2 spectral flow

Spectral flow is the standard way a sign is associated to a point in a zero-dimensional moduli space of curves (I am not sure what you mean by VFC here, it's 0-dimensional). This involves orienting th …
Chris Gerig's user avatar
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7 votes
Accepted

Moduli space of curves

Convergence to cusp curves is the original compactification by Gromov, whereas convergence to stable maps is the compactification by Kontsevich (a cusp curve corresponds to the image of a stable map). …
Chris Gerig's user avatar
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6 votes
Accepted

An orientable compact even dimensional manifolds whose all even cohomologies do not vanish b...

For your $n=2k$, $\mathbb{C} P^n\#\mathbb{C} P^n$ does not even admit an almost complex structure, so it cannot be symplectic. See also: 1) Goertsches-Konstantis' paper "Almost complex structures on …
Chris Gerig's user avatar
  • 17.5k
9 votes

Proof of Giroux's correspondence

This might suffice for you, it is not published and only slightly longer than Etnyre's sketch, but without exercises. This has been shown in the PhD thesis of Noah Daniel Goodman (a student of Etnyre) …
Ian Agol's user avatar
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