Kavli Affiliate: Gordan Z. Krnjaic
| First 5 Authors: Christopher J. Shallue, Julian B. Muñoz, Gordan Z. Krnjaic, ,
| Summary:
We study the cosmological impact of warm, dark-sector relic particles
produced as Hawking radiation in a primordial-black-hole-dominated universe
before big bang nucleosynthesis. If these dark-sector particles are stable,
they would survive to the present day as "Hawking relics" and modify the growth
of cosmological structure. We show that such relics are produced with much
larger momenta, but in smaller quantities than the familiar thermal relics
considered in standard cosmology. Consequently, Hawking relics with keV-MeV
masses affect the growth of large-scale structure in a similar way to eV-scale
thermal relics like massive neutrinos. We model their production and evolution,
and show that their momentum distributions are broader than comparable relics
with thermal distributions. Warm Hawking relics affect the growth of
cosmological perturbations and we constrain their abundance to be less than
$2%$ of the dark matter over a broad range of their viable parameter space.
Finally, we examine how future measurements of the matter power spectrum can
distinguish Hawking relics from thermal particles.
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