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Title: Implications of BBN bounds for cosmic ray upscattered dark matter

Journal Article · · Physical Review. D.

We consider the big bang nucleosynthesis (BBN) bounds on light dark matter whose cross section off nucleons is sufficiently large to enable acceleration by scattering off of cosmic rays in the local galaxy. Such accelerated DM could then deposit energy in terrestrial detectors. Since this signal involves DM of mass ~keV-GeV and requires large cross sections ≳10-31 cm2 in a relativistic kinematic regime, we find that the DM population in this scenario is generically equilibrated with Standard Model particles in the early universe. For sufficiently low DM masses ≲10 MeV, corresponding to much of the favored region of many cosmic-ray upscattering studies, this equilibrated DM population adds an additional component to the relativistic energy density around T~few MeV and thereby spoils the successful predictions of BBN. In the remaining ~10 MeV–GeV mass range, the large couplings required in this scenario are either currently excluded or within reach of current or future accelerator-based searches.

Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
AC02-07CH11359
OSTI ID:
1634132
Alternate ID(s):
OSTI ID: 1557454
Report Number(s):
arXiv:1908.00007; FERMILAB-PUB-19-358-A; PRVDAQ; 123022
Journal Information:
Physical Review. D., Journal Name: Physical Review. D. Vol. 101 Journal Issue: 12; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 31 works
Citation information provided by
Web of Science

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