Mergers of primordial black holes in extreme clusters and the $H_0$ tension. (arXiv:2105.03704v2 [astro-ph.CO] UPDATED)
<a href="http://arxiv.org/find/astro-ph/1/au:+Eroshenko_Y/0/1/0/all/0/1">Yury Eroshenko</a>
We consider a cosmological model with dark matter in the form of
$sim10^{-12}M_odot$ primordial black holes in dense weakly relativistic
clusters with masses $18-560M_odot$. It is shown that during the multiple
collisions of the black holes the $sim10$% of the initial cluster mass can be
transformed into gravitational waves in the time interval from recombination to
the redshifts $zgeq 10$. At the recombination epoch, the density of matter was
larger by $sim10$% and, accordingly, the universe expansion rate was higher.
This leads to a shortening of the sound horizon scale, as is necessary to solve
the “$H_0$ tension” problem.
We consider a cosmological model with dark matter in the form of
$sim10^{-12}M_odot$ primordial black holes in dense weakly relativistic
clusters with masses $18-560M_odot$. It is shown that during the multiple
collisions of the black holes the $sim10$% of the initial cluster mass can be
transformed into gravitational waves in the time interval from recombination to
the redshifts $zgeq 10$. At the recombination epoch, the density of matter was
larger by $sim10$% and, accordingly, the universe expansion rate was higher.
This leads to a shortening of the sound horizon scale, as is necessary to solve
the “$H_0$ tension” problem.
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