Counting real pseudo-holomorphic discs and spheres in dimension four and six

Details Counting real pseudo-holomorphic discs and spheres in dimension four and six Counting real pseudo-holomorphic discs and spheres in dimension four and six

2006-04-24

arxiv.org/abs/math/0604501v2

Mathematics

Symplectic Geometry

18 pages, 2 figures, typo corrected

Scientific paper

First, we provide another proof that the signed count of the real $J$-holomorphic spheres (or $J$-holomorphic discs) passing through a generic real configuration of $k$ points is independent of the choice of the real configuration and the choice of $J$, if the dimension of the Lagrangian submanifold $L$ (fixed points set of the involution) is two or three, and also if we assume $L$ is orientable and relatively spin, and $M$ is strongly semi-positive. This theorem was first proved by Welschinger in a more general setting, and we provide more natural approach using the degree of evaluation maps from the moduli spaces of $J$-holomorphic discs. Then, we define the invariant count of discs intersecting cycles of a symplectic manifold at fixed interior marked points, and intersecting real points at the boundary under certain assumptions. The last result is new and was not proved by Welshinger's method.

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