${\mathrm{Pin}}^{-}(2)$-monopole invariants

Abstract

We introduce a diffeomorphism invariant of $4$-manifolds, the ${\mathrm{Pin}}^{-}(2)$-monopole invariant, defined by using the ${\mathrm{Pin}}^{-}(2)$-monopole equations. We compute the invariants of several $4$-manifolds, and prove gluing formulae. By using the invariants, we construct exotic smooth structures on the connected sum of an elliptic surface $E(n)$ with arbitrary number of the $4$-manifolds of the form of $S^2\times \Sigma$ or $S^1\times Y$ where $\Sigma$ is a compact Riemann surface with positive genus and $Y$ is a closed $3$-manifold. As another application, we give an estimate of the genus of surfaces embedded in a $4$-manifold $X$ representing a class $\alpha \in H_2(X;l)$, where $l$ is a local coefficient on $X$.

48 pages, minor revision

References in corpus (1)

• Pin^-(2)-monopole equations and intersection forms with local coefficients of 4-manifolds

Cited by in corpus (1)

• Yamabe Invariants and the ${\mathrm{Pin}}^{-}(2)$-monopole Equations