On the gravitational radiation from the collapse of neutron stars to rotating black holes

TL;DR

This paper presents a detailed numerical study of gravitational-wave emission during neutron star collapse to rotating black holes, exploring excision techniques and the effects of rotation and perturbations on waveforms.

Contribution

It introduces alternative methods to excision for simulating collapse and systematically analyzes how rotation and perturbations influence gravitational wave signals.

Findings

Excision techniques have specific advantages and disadvantages.

Rotation and perturbations significantly affect gravitational waveforms.

The study provides insights for source characterization in gravitational wave astronomy.

Abstract

We provide details and present additional results on the numerical study of the gravitational-wave emission from the collapse of neutron stars to rotating black holes in three dimensions. More specifically, we concentrate on the advantages and disadvantages of the use of the excision technique and on how alternative approaches to that of excision can be successfully employed. Furthermore, as a first step towards source-characterization, we present a systematic discussion of the influence that rotation and different perturbations have on the waveforms and hence on the energy emitted in gravitational waves.