The additivity of the $ρ$-invariant and periodicity in topological surgery

Details The additivity of the $ρ$-invariant and periodicity in topological surgery The additivity of the $ρ$-invariant and periodicity in topological surgery

2010-02-09

arxiv.org/abs/1002.1917v1

Mathematics

Geometric Topology

Scientific paper

For a closed topological manifold M with dim (M) >= 5 the topological structure set S(M) admits an abelian group structure which may be identified with the algebraic structure group of M as defined by Ranicki. If dim (M) = 2d-1, M is oriented and M is equipped with a map to the classifying space of a finite group G, then the reduced rho-invariant defines a function, \wrho : S(M) \to \QQ R_{hat G}^{(-1)^d}, to a certain sub-quotient of the complex representation ring of G. We show that the function \wrho is a homomorphism when 2d-1 >= 5. Along the way we give a detailed proof that a geometrically defined map due to Cappell and Weinberger realises the 8-fold Siebenmann periodicity map in topological surgery.

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