The wave resolvent for compactly supported perturbations of static spacetimes

Abstract

In this note, we consider the wave operator ${\square }_g$ in the case of globally hyperbolic, compactly supported perturbations of static spacetimes. We give an elementary proof of the essential self-adjointness of ${\square }_g$ and of uniform microlocal estimates for the resolvent in this setting. This provides a model for studying Lorentzian spectral zeta functions which is particularly simple, yet sufficiently general for locally deriving Einstein equations from a spectral Lagrangian.

15 pages; v2: typos fixed