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Title: Dark sector equilibration during nucleosynthesis

Abstract

Light, weakly coupled dark sectors may be naturally decoupled in the early Universe and enter equilibrium with the Standard Model bath during the epoch of primordial nucleosynthesis. The equilibration and eventual decoupling of dark sector states modifies the expansion rate of the Universe, which alters the predicted abundances of the light elements. This result can be encompassed in a time-varying contribution to N eff, the effective number of neutrino species, such that N eff during nucleosynthesis differs from its measured value at the time of recombination. We investigate the impact of such variations on the light element abundances with model-independent templates for the time dependence of N eff as well as in specific models where a dark sector equilibrates with neutrinos or photons. We reveal that significant modifications of the expansion rate are consistent with the measured abundances of light nuclei, provided that they occur during specific periods of nucleosynthesis. In constraining concrete models, the relative importance of the cosmic microwave background and primordial nucleosynthesis is highly model dependent.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1545437
Alternate Identifier(s):
OSTI ID: 1545104
Report Number(s):
arXiv:1904.04256; FERMILAB-PUB-19-138-A-T; SLAC-PUB-17421
Journal ID: ISSN 2470-0010; PRVDAQ; 1728965
Grant/Contract Number:  
AC02-07CH11359; AC02-76SF00515
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 100; Journal Issue: 1; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Berlin, Asher, Blinov, Nikita, and Li, Shirley Weishi. Dark sector equilibration during nucleosynthesis. United States: N. p., 2019. Web. doi:10.1103/PhysRevD.100.015038.
Berlin, Asher, Blinov, Nikita, & Li, Shirley Weishi. Dark sector equilibration during nucleosynthesis. United States. doi:10.1103/PhysRevD.100.015038.
Berlin, Asher, Blinov, Nikita, and Li, Shirley Weishi. Wed . "Dark sector equilibration during nucleosynthesis". United States. doi:10.1103/PhysRevD.100.015038.
@article{osti_1545437,
title = {Dark sector equilibration during nucleosynthesis},
author = {Berlin, Asher and Blinov, Nikita and Li, Shirley Weishi},
abstractNote = {Light, weakly coupled dark sectors may be naturally decoupled in the early Universe and enter equilibrium with the Standard Model bath during the epoch of primordial nucleosynthesis. The equilibration and eventual decoupling of dark sector states modifies the expansion rate of the Universe, which alters the predicted abundances of the light elements. This result can be encompassed in a time-varying contribution to Neff, the effective number of neutrino species, such that Neff during nucleosynthesis differs from its measured value at the time of recombination. We investigate the impact of such variations on the light element abundances with model-independent templates for the time dependence of Neff as well as in specific models where a dark sector equilibrates with neutrinos or photons. We reveal that significant modifications of the expansion rate are consistent with the measured abundances of light nuclei, provided that they occur during specific periods of nucleosynthesis. In constraining concrete models, the relative importance of the cosmic microwave background and primordial nucleosynthesis is highly model dependent.},
doi = {10.1103/PhysRevD.100.015038},
journal = {Physical Review D},
number = 1,
volume = 100,
place = {United States},
year = {2019},
month = {7}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevD.100.015038

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Cited by: 1 work
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