Author:
Hütsi Gert,Raidal Martti,Vaskonen Ville,Veermäe Hardi
Abstract
Abstract
We analyse the LIGO-Virgo data, including the recently
released GWTC-2dataset, to test a hypothesis that the data contains
more than one population of black holes. We perform a maximum
likelihood analysis including a population of astrophysical black
holes with a truncated power-law mass function whose merger rate
follows from star formation rate, and a population of primordial
black holes for which we consider log-normal and critical collapse
mass functions. We find that primordial black holes alone are
strongly disfavoured by the data, while the best fit is obtained for
the template combining astrophysical and primordial merger
rates. Alternatively, the data may hint towards two different
astrophysical black hole populations. We also update the constraints
on primordial black hole abundance from LIGO-Virgo observations
finding that in the 2–400 mass range they must
comprise less than 0.2% of dark matter.
Subject
Astronomy and Astrophysics
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