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Title: Dark radiation and superheavy dark matter from black hole domination

Abstract

If even a relatively small number of black holes were created in the early universe, they will constitute an increasingly large fraction of the total energy density as space expands. It is thus well-motivated to consider scenarios in which the early universe included an era in which primordial black holes dominated the total energy density. Within this context, we consider Hawking radiation as a mechanism to produce both dark radiation and dark matter. If the early universe included a black hole dominated era, we find that Hawking radiation will produce dark radiation at a level $$\Delta N_{\rm eff} \sim 0.03-0.2$$ for each light and decoupled species of spin 0, 1/2, or 1. This range is well suited to relax the tension among late and early-time Hubble determinations, and is within the reach of upcoming CMB experiments. The dark matter could additionally originate as Hawking radiation in a black hole dominated early universe, although such dark matter candidates must be very heavy ($$m_{\rm DM} >10^{11}$$ GeV) if they are to avoid exceeding the measured abundance.

Authors:
 [1];  [2];  [2]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Univ. of Chicago, IL (United States)
  2. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1545087
Report Number(s):
arXiv:1905.01301; FERMILAB-PUB-19-186-A
Journal ID: ISSN 1029-8479; 1733139
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2019; Journal Issue: 8; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Beyond Standard Model; Cosmology of Theories beyond the SM

Citation Formats

Hooper, Dan, Krnjaic, Gordan, and McDermott, Samuel D. Dark radiation and superheavy dark matter from black hole domination. United States: N. p., 2019. Web. doi:10.1007/JHEP08(2019)001.
Hooper, Dan, Krnjaic, Gordan, & McDermott, Samuel D. Dark radiation and superheavy dark matter from black hole domination. United States. https://doi.org/10.1007/JHEP08(2019)001
Hooper, Dan, Krnjaic, Gordan, and McDermott, Samuel D. Thu . "Dark radiation and superheavy dark matter from black hole domination". United States. https://doi.org/10.1007/JHEP08(2019)001. https://www.osti.gov/servlets/purl/1545087.
@article{osti_1545087,
title = {Dark radiation and superheavy dark matter from black hole domination},
author = {Hooper, Dan and Krnjaic, Gordan and McDermott, Samuel D.},
abstractNote = {If even a relatively small number of black holes were created in the early universe, they will constitute an increasingly large fraction of the total energy density as space expands. It is thus well-motivated to consider scenarios in which the early universe included an era in which primordial black holes dominated the total energy density. Within this context, we consider Hawking radiation as a mechanism to produce both dark radiation and dark matter. If the early universe included a black hole dominated era, we find that Hawking radiation will produce dark radiation at a level $\Delta N_{\rm eff} \sim 0.03-0.2$ for each light and decoupled species of spin 0, 1/2, or 1. This range is well suited to relax the tension among late and early-time Hubble determinations, and is within the reach of upcoming CMB experiments. The dark matter could additionally originate as Hawking radiation in a black hole dominated early universe, although such dark matter candidates must be very heavy ($m_{\rm DM} >10^{11}$ GeV) if they are to avoid exceeding the measured abundance.},
doi = {10.1007/JHEP08(2019)001},
journal = {Journal of High Energy Physics (Online)},
number = 8,
volume = 2019,
place = {United States},
year = {2019},
month = {8}
}

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Cited by: 7 works
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