Seiberg-Witten Theory and Z/2^p actions on spin 4-manifolds

Details Seiberg-Witten Theory and Z/2^p actions on spin 4-manifolds Seiberg-Witten Theory and Z/2^p actions on spin 4-manifolds

1997-04-22

arxiv.org/abs/dg-ga/9704010v1

Mathematics

Differential Geometry

Latex2e, 16 pages

Scientific paper

Furuta's ``10/8-th's'' theorem gives a bound on the magnitude of the signature of a smooth spin 4-manifold in terms of the second Betti number. We show that in the presence of a Z/2^p action, his bound can be strengthened. As applications, we give new genus bounds on classes with divisibility and we give a classification of involutions on rational cohomology K3's. We utilize the action of a twisted product of Pin(2) and Z/2^p on the Seiberg-Witten moduli space. Our techniques also provide a simplification of the proof of Furuta's theorem.

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