The essential spectra of Fourier integral operators (and related operators) on L²(R), determined by piecewise continuous symbol functions, are derived from a ...

Let X = {X t : t ≥ 0} be a stationary piecewise continuous ℝ d -valued process that moves between jumps along the integral curves of a given continuous vector field, and let S ᑕ ℝ d be a smooth ...