Kavli Affiliate: Ulrich Sperhake
| First 5 Authors: Davide Gerosa, Cecilia Maria Fabbri, Ulrich Sperhake, ,
| Summary:
The mass of a Kerr black hole can be separated into irreducible and
rotational components -the 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 stellar-mass black holes observed by
gravitational-wave interferometers LIGO and Virgo. Using single-event data, we
present a re-parametrization of the posterior distribution that explicitly
highlights the irreducible and rotational contributions to the total energy. We
exploit the area law to rank the black-hole mergers observed to date according
to their irreversibility. Using population fits, we compute the rate by which
the total area of black-hole horizons increases due to the observable mergers.
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