Abstract
Observations have found black holes spanning ten orders of magnitude in mass
across most of cosmic history. The Kerr black hole solution is however
provisional as its behavior at infinity is incompatible with an expanding
universe. Black hole models with realistic behavior at infinity predict that
the gravitating mass of a black hole can increase with the expansion of the
universe independently of accretion or mergers, in a manner that depends on the
black hole's interior solution. We test this prediction by considering the
growth of supermassive black holes in elliptical galaxies over
$0<złesssim2.5$. We find evidence for cosmologically coupled mass growth among
these black holes, with zero cosmological coupling excluded at 99.98%
confidence. The redshift dependence of the mass growth implies that, at
$złesssim7$, black holes contribute an effectively constant cosmological
energy density to Friedmann's equations. The continuity equation then requires
that black holes contribute cosmologically as vacuum energy. We further show
that black hole production from the cosmic star formation history gives the
value of $Ømega_Łambda$ measured by Planck while being consistent with
constraints from massive compact halo objects. We thus propose that stellar
remnant black holes are the astrophysical origin of dark energy, explaining the
onset of accelerating expansion at $z 0.7$.
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