Surgery and the spinorial tau-invariant

Details Surgery and the spinorial tau-invariant Surgery and the spinorial tau-invariant

2007-10-30

arxiv.org/abs/0710.5673v3

Comm. Partial Differential Equations 34 (2009), no. 10-12, 1147-1179

Mathematics

Differential Geometry

to appear in CPDE

Scientific paper

10.1080/03605300902769204

We associate to a compact spin manifold M a real-valued invariant \tau(M) by taking the supremum over all conformal classes over the infimum inside each conformal class of the first positive Dirac eigenvalue, normalized to volume 1. This invariant is a spinorial analogue of Schoen's $\sigma$-constant, also known as the smooth Yamabe number. We prove that if N is obtained from M by surgery of codimension at least 2, then $\tau(N) \geq \min\{\tau(M),\Lambda_n\}$ with $\Lambda_n>0$. Various topological conclusions can be drawn, in particular that \tau is a spin-bordism invariant below $\Lambda_n$. Below $\Lambda_n$, the values of $\tau$ cannot accumulate from above when varied over all manifolds of a fixed dimension.

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