Cohomotopy invariants and the universal cohomotopy invariant jump formula

Andrei Teleman (1) , Christian Okonek (2)

1 LATP - Laboratoire d'Analyse, Topologie, Probabilités
2 Institut für Mathematik [Zürich]

Starting from ideas of Furuta, we develop a general formalism for the construction of cohomotopy invariants associated with a certain class of S1-equivariant non-linear maps between Hilbert bundles. Applied to the Seiberg-Witten map, this formalism yields a new class of cohomotopy Seiberg- Witten invariants which have clear functorial properties with respect to diffeomorphisms of 4-manifolds. Our invariants and the Bauer-Furuta classes are directly comparable for 4-manifolds with b_1 = 0; they are equivalent when b_1 =0 and b_+ >1, but are finer in the case b1 =0, b+ =1 (they detect the wall-crossing phenomena). We study fundamental properties of the new invariants in a very general framework. In particular we prove a universal cohomotopy invariant jump formula and a multiplicative property. The formalism applies to other gauge theoretical problems, e.g. to the theory of gauge theoretical (Hamiltonian) Gromov-Witten invariants.

Mots clés: Seiberg-Witten invariants; cohomotopy invariants; wall crossing; 4-manifolds

Domaines: Topologie algébrique [math.AT]; Topologie géométrique [math.GT]

Andrei Teleman, Christian Okonek. Cohomotopy invariants and the universal cohomotopy invariant jump formula. J. Math. Sci. Univ. Tokyo, 2008, 15 (3), pp.325-409. ⟨hal-00881333⟩