# Acoustic transmission problems: wavenumber-explicit bounds and resonance-free regions

## TL;DR

This paper establishes explicit bounds for solutions to the Helmholtz transmission problem involving star-shaped Lipschitz obstacles, demonstrating resonance-free regions and advancing understanding with less restrictive geometric assumptions.

## Contribution

It provides the first wavenumber-explicit bounds for Lipschitz, star-shaped obstacles, using Morawetz identities instead of microlocal analysis, and shows resonance-free regions under natural conditions.

## Key findings

- Bounds on solutions are explicit in all parameters.
- Existence of resonance-free strips beneath the real axis.
- Bounds hold for Lipschitz, star-shaped obstacles, not just smooth convex ones.

## Abstract

We consider the Helmholtz transmission problem with one penetrable star-shaped Lipschitz obstacle. Under a natural assumption about the ratio of the wavenumbers, we prove bounds on the solution in terms of the data, with these bounds explicit in all parameters. In particular, the (weighted) $H^1$ norm of the solution is bounded by the $L^2$ norm of the source term, independently of the wavenumber. These bounds then imply the existence of a resonance-free strip beneath the real axis. The main novelty is that the only comparable results currently in the literature are for smooth, convex obstacles with strictly positive curvature, while here we assume only Lipschitz regularity and star-shapedness with respect to a point. Furthermore, our bounds are obtained using identities first introduced by Morawetz (essentially integration by parts), whereas the existing bounds use the much-more sophisticated technology of microlocal analysis and propagation of singularities. We also recap existing results that show that if the assumption on the wavenumbers is lifted, then no bound with polynomial dependence on the wavenumber is possible.