Weinberger's boundary-relative homotopy invariance conjecture for the rho-invariant

Let F ⁣:XXF\colon X\to X' be a homotopy equivalence of manifolds with torsion-free fundamental groups that restricts to a diffeomorphism on the boundary. Equip the boundaries with Riemannian metrics gg and gg' such that the restriction of FF to the boundary is an isometry. Let α ⁣:π1XU(n)\alpha\colon \pi_1X\to U(n) be a unitary representation, with the corresponding representation on XX' understood via the homotopy equivalence. Weinberger's boundary-relative conjecture. For any such representation,

ρ(X,α,g)=ρ(X,α,g).\rho(X,\alpha,g)=\rho(X',\alpha,g').

This extends Weinberger's homotopy-invariance conjecture to manifolds with boundary. The supplied text does not state whether this extension is known or refuted; the preceding discussion establishes related positive results for some groups and counterexamples to the unrestricted closed-manifold version.

Sources & referencesView supporting material

Primary source

Paul Kirk and Matthias Lesch, “On the rho invariant for manifolds with boundary”, arXiv:math/0203097 (2003).

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