Szegő kernel asymptotics and concentration of Husimi Distributions of eigenfunctions

Abstract: We work on the boundary $\partial M_\tau$ of a Grauert tube of a closed, real analytic Riemannian manifold $M$. The Toeplitz operator $\Pi_\tau D_{\sqrt{\rho}} \Pi_\tau$ associated to the Reeb vector field is a positive, self-adjoint, elliptic operator on $H^2(\partial M_\tau)$. We compute $\lambda \to \infty$ asymptotics under parabolic rescaling in a neighborhood of the geodesic (Reeb) flow $G^{t}_{\tau} = \exp t\Xi_{\sqrt{\rho}}$ for the spectral projection kernel $\Pi_{\chi, \lambda}$ associated to $\Pi_\tau D_{\sqrt{\rho}} \Pi_\tau$. We also compute scaling asymptotics for tempered sums of Husimi distributions (analytic continuations) on $\partial M_\tau$ of Laplace eigenfunctions on $M$. Both asymptotic formulae can be expressed in terms of the metaplectic representation of the linearization of the geodesic flow $G^{t}_\tau$ on Bargmann--Fock space. As a corollary, we obtain sharp $L^p \to L^{q}$ norm estimates for $\Pi_{\chi, \lambda}$ and sharp $L^p$ estimates for Husimi distributions.