The irreducible mass and the horizon area of LIGO's black holes
Abstract
The mass of a Kerr black hole (BH) can be separated into irreducible and rotational componentsthe former is a lower limit to the energy that cannot be possibly extracted from the event horizon and is related to its area. Here we compute the irreducible masses of the stellarmass BHs observed by gravitationalwave interferometers LIGO and Virgo. Using singleevent data, we present a reparameterization of the posterior distribution that explicitly highlights the irreducible and rotational contributions to the total energy. We exploit the area law to rank the blackhole mergers observed to date according to their irreversibility, thus providing a guide to selecting events for targeted tests of general relativity. Using population fits, we compute the rate by which the total area of blackhole horizons increases due to the observable mergers.
 Publication:

Classical and Quantum Gravity
 Pub Date:
 September 2022
 DOI:
 10.1088/13616382/ac8332
 arXiv:
 arXiv:2202.08848
 Bibcode:
 2022CQGra..39q5008G
 Keywords:

 gravitational waves;
 black holes;
 LIGO;
 General Relativity and Quantum Cosmology;
 Astrophysics  High Energy Astrophysical Phenomena
 EPrint:
 14 pages, 6 figures