NAJAR Hatem
Lifshitz tails for random acoustic operators
(115K, AMS-TeX)

ABSTRACT.  Using techniques developed in [Kp1], we prove that 
the integrated density of states of $A_{\omega}=-\nabla\frac{1}{\varrho_{\omega}}\nabla$ has 
Lifshitz behavior in the neighborhood of the internal spectral 
gaps if and only if the integrated density of states of some periodic operator 
is non degenerated on the same edge of the spectral gaps.\\ From this result we obtain the initial estimates necessary for deducing localization near 
non degenerate band edges.