L^2-Invariants of Finite Aspherical CW-Complexes

Details L^2-Invariants of Finite Aspherical CW-Complexes L^2-Invariants of Finite Aspherical CW-Complexes

2008-05-27

arxiv.org/abs/0805.4150v1

Mathematics

Geometric Topology

11 pages

Scientific paper

Let $X$ be a finite aspherical CW-complex whose fundamental group $\pi_1(X)$ possesses a subnormal series $\pi_1(X) \rhd G_m \rhd ... \rhd G_0$ with a non-trivial elementary amenable group $G_0$. We investigate the $L^2$-invariants of the universal covering of such a CW-complex $X$. We show that the Novikov-Shubin invariants $\alpha_n({\tilde X})$ are positive. We further prove that the $L^2$-torsion $\rho^{(2)}({\tilde X})$ vanishes if $\pi_1(X)$ has semi-integral determinant.

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