2026/08/03 by Alex Rojewski, Cecilia Lunardini
Physics and Astronomy · #astro-ph.HE #astro-ph.CO #gr-qc
20 pages, 9 figures, to be submitted to PRD. Comments welcome!
arxiv created 2026/08/03 · arxiv updated 2026/08/05
Gravitational waves originating from unresolved sources, or stochastic gravitational wave backgrounds (SGWBs), carry precious information about the physics underlying their diverse sources, and represent an important target for future experimental searches. Here, we model the SGWB due to core collapse supernovae. Using an extensive collection of state-of-the-art, three-dimensional, multi-second supernova simulations, we characterize the two main components of this background: one at f ∼ 10-2 - 1 Hz, due to anisotropic neutrino emission (the gravitational wave memory); the other at f \gtrsim 102 Hz, from the near-core matter dynamics. We find that the memory component offers the best prospects of detection, as its characteristic peak at f∼ 0.1 Hz is within the reach of future space-born detectors. At the peak, the energy density might be comparable to that of backgrounds from slow roll inflation and from possible cosmological relics, thus potentially impacting searches of these important signals.