%0 Journal Article
%T Estimates for spectral density functions of matrices over C[Z^d]
%A Wolfgang Lueck
%J Mathematics
%D 2013
%I arXiv
%X We give a polynomial bound on the spectral density function of a matrix over the complex group ring of Z^d. It yields an explicit lower bound on the Novikov-Shubin invariant associated to this matrix showing in particular that the Novikov-Shubin invariant is larger than zero.
%U http://arxiv.org/abs/1310.8564v2