Probing the nature of the horizon with Gravitational-waves

by Yotam Sherf

Ben-Gurion University

at Particles and Fields Seminar

Mon, 20 Jun 2022, 14:00
Sacta-Rashi Building for Physics (54), room 207

Abstract

One hundred years after the revolutionary discovery of Einstein's General Relativity (GR), we were first able to confirm Einstein's prediction and measure the Gravitational-wave emission from the coalescence of two Black-holes (BHs)s. This direct evidence of BHs made by the Laser interferometer GW observation (LIGO) launched the era of gravitational-waves astrophysics. It opened us to an unprecedented opportunity to probe the nature of BHs up to the horizon scale and use GWs as a microscope.
In this talk, I'll demonstrate how by performing long-duration observation in the post-merger data immediately following GW150914, we are able to impose significant constraints on the near-horizon region of the Kerr geometry. In the second part of the talk, I'll discuss the GR prediction, suggesting that BHs are empty. We address a simple question - are BHs empty or not? I'll show how a new type of universal model-independent hair can answer this question, thus confirming the validity of GR.

Created on 17-06-2022 by Palti, Eran (palti)
Updaded on 17-06-2022 by Palti, Eran (palti)