An interesting symplectic 4-manifold with small Euler characteristic

Details An interesting symplectic 4-manifold with small Euler characteristic An interesting symplectic 4-manifold with small Euler characteristic

2007-01-15

arxiv.org/abs/math/0701400v2

Mathematics

Geometric Topology

revised. 13 pages. details on minimality and more examples

Scientific paper

In this article we construct a minimal symplectic 4-manifold R that has small Euler characteristic (e(R)=8) and two essential Lagrangian tori with nice properties. These properties make R particularly suitable for constructing interesting examples of symplectic manifolds with small Euler characteristic. In particular, we construct an exotic symplectic CP^2# 5(-CP^2), the smallest known minimal symplectic 4-manifold with pi_1=Z, the smallest known minimal symplectic 4-manifolds with pi_1=Z/a + Z/b for all a,b in Z, and the smallest known minimal symplectic 4-manifold with pi_1=Z^3. We use the pi_1=Z example to derive a significantly better upper bound on the minimal Euler characteristic of all symplectic 4-manifolds with a prescribed fundamental group.

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