Stochastic Gravitational-Wave Background from Stellar Core-Collapse Events

TL;DR

This paper estimates the gravitational-wave background from stellar core-collapse events, finding it to be much weaker than the sensitivity of upcoming detectors and likely overshadowed by cosmological signals.

Contribution

It provides the first comprehensive estimate of the stochastic gravitational-wave background from all stellar core-collapse events using recent numerical simulations.

Findings

Estimated background is over 100 times below third-generation detector sensitivity.

The background is weaker than cosmological gravitational-wave contributions.

Focus on non-rotating and extreme rotating stellar progenitors.

Abstract

We estimate the stochastic gravitational-wave background arising from all stellar core-collapse events in the universe based on the gravitational-wave signal predictions of recent numerical simulations. We focus on waveforms from slowly or non-rotating stars and include rapidly rotating, highly massive progenitors as extreme case limits. Our most realistic estimates are more than one hundred times below the sensitivity of third-generation terrestrial gravitational-wave detectors and likely weaker than cosmological contributions to the stochastic gravitational-wave background.