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Gravitational waves from ultra-compact stars: new theoretical results

Science and Information Technology

Presentation of a recent analytic solution (Horak & Abramowicz 2021, unpublished) that describes quasi-normal modes of super-compact stars close to the Bondi limit.

Seminar
Date
15 Apr 2021
Time
15:15 - 16:30
Location
Zoom

Zoom link: https://gu-se.zoom.us/j/2119655087?pwd=UHJNdG9QT0doZnRtelowVzRvWDkzZz09

Title: Gravitational waves from ultra-compact stars: new theoretical results

Speaker

Prof. Marek Abramowicz, University of Gothenburg

Abstract

I present a recent analytic solution (Horak & Abramowicz 2021, unpublished) that describes quasi-normal modes of super-compact stars close to the Bondi limit. In the LIGO-Virgo terminology these are wave-fronts and frequencies of ringdowns and echoes. The new results will help distinguishing between black hole versus non black hole origin of the waves. They may also constrain some quantum-gravity ideas about the quantum black hole alternatives, like firewalls and gravastars.

Contact

Henrik Johannesson, henrik.johannesson@physics.gu.se