Resumen de Symplectic symmetries of 4-manifolds

Weimin Chen, Slawomir Kwasik

• A study of symplectic actions of a finite group on smooth 4-manifolds is initiated. The central new idea is the use of -equivariant Seiberg¿Witten¿Taubes theory in studying the structure of the fixed-point set of these symmetries. The main result in this paper is a complete description of the fixed-point set structure (and the action around it) of a symplectic cyclic action of prime order on a minimal symplectic 4-manifold with . Comparison of this result with the case of locally linear topological actions is made. As an application of these considerations, the triviality of many such actions on a large class of 4-manifolds is established. In particular, we show the triviality of homologically trivial symplectic symmetries of a surface (in analogy with holomorphic automorphisms). Various examples and comments illustrating our considerations are also included