Electronic Journal of Differential Equations,
Vol. 2006(2006), No. 60, pp. 1-11.

Title: Resonances generated by analytic singularities on the
       density of states measure for perturbed  periodic 
       Schrodinger operators

Authors: Hamadi Baklouti (Faculte des Sciences de Sfax, Tunisie)
         Maher Mnif (I.P.E.I. Sfax, Tunisie)

Abstract: 
 We consider a perturbation of  a periodic
 Shrodinger operator $P_0$ by a potential $W(hx)$,
 $(h\searrow 0)$. We study singularities of the density
 of states measure and we obtain lower bound for the 
 counting function of resonances.
 
Submitted March 16, 2006. Published May 4, 2006.
Math Subject Classifications: 35B34, 35B20, 35P15, 35J10.
Key Words: Resonances; perturbations; 
           periodic Schrodinger operators.