Eigenvalue Asymptotics in a Twisted Waveguide

Abstract

We consider a twisted quantum wave guide i.e., a domain of the form :=r x where 2 is a bounded domain, and r=r(x3) is a rotation by the angle (x3) depending on the longitudinal variable x3. We are interested in the spectral analysis of the Dirichlet Laplacian H acting in L2(). We suppose that the derivative [image omitted] of the rotation angle can be written as [image omitted](x3)=-epsilon(x3) with a positive constant and epsilon(x3) L|x3|-, |x3|. We show that if L0 and (0,2), or if LL00 and =2, then there is an infinite sequence of discrete eigenvalues lying below the infimum of the essential spectrum of H, and obtain the main asymptotic term of this sequence.