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 those dark-sector particles are stable,
they would survive to the present day as "Hawking relics" and modify the
subsequent 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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