Spectral multipliers and wave propagation for Hamiltonians with a scalar potential

We extend several fundamental estimates regarding spectral multipliers for the free Laplacian on ${\mathbb{R}}^3$ to the case of perturbed Hamiltonians of the form $-\mathrm{\Delta }+V$, where $V$ is a scalar real-valued potential. In this paper, we prove resolvent estimates, a dispersive bound for the perturbed wave propagator, Mihlin multiplier and fractional integration bounds, and the full range of wave equation Strichartz estimates, under optimal or almost optimal scaling-invariant conditions on the potential and on the spectral multipliers themselves.