The scattering phase: seen at last - Archive ouverte HAL Access content directly
Journal Articles SIAM Journal on Applied Mathematics Year : 2024

The scattering phase: seen at last

Abstract

The scattering phase, defined as $ \log \det S ( \lambda ) / 2\pi i $ where $ S ( \lambda ) $ is the (unitary) scattering matrix, is the analogue of the counting function for eigenvalues when dealing with exterior domains and is closely related to Krein's spectral shift function. We revisit classical results on asymptotics of the scattering phase and point out that it is never monotone in the case of strong trapping of waves. Perhaps more importantly, we provide the first numerical calculations of scattering phases for non-radial scatterers. They show that the asymptotic Weyl law is accurate even at low frequencies and reveal effects of trapping such as lack of monotonicity. This is achieved by using the recent high level multiphysics finite element software FreeFEM.

Dates and versions

hal-03820689 , version 1 (19-10-2022)

Identifiers

Cite

Jeffrey Galkowski, Pierre Marchand, Jian Wang, Maciej Zworski. The scattering phase: seen at last. SIAM Journal on Applied Mathematics, 2024, 84 (1), pp.246-261. ⟨10.1137/23M1547147⟩. ⟨hal-03820689⟩
65 View
0 Download

Altmetric

Share

Gmail Facebook X LinkedIn More