Weyl's Law and Connes' Trace Theorem for Noncommutative Two Tori

Abstract

We prove the analogue of Weyl's law for a noncommutative Riemannian manifold, namely the noncommutative two torus $\mathbb{T}_θ^2$ equipped with a general translation invariant conformal structure and a Weyl conformal factor. This is achieved by studying the asymptotic distribution of the eigenvalues of the perturbed Laplacian on $\mathbb{T}_θ^2$. We also prove the analogue of Connes' trace theorem by showing that the Dixmier trace and a noncommutative residue coincide on pseudodifferential operators of order -2 on $\mathbb{T}_θ^2$.

17 pages. Derivation of small time heat kernel expansion and the construction of the Dixmier trace is expanded, one reference added, to appear in Letters in Mathematical Physics