Warm decaying dark matter and the hubble tension
Abstract
If a fraction of the dark matter is unstable and decays into dark radiation at around the time of matter-radiation equality, it could impact the expansion history of the universe in a way that helps to ameliorate the long-standing tension between the locally measured value of the Hubble constant and the value inferred from measurements of the cosmic microwave background and baryon acoustic oscillations (assuming standard $$\Lambda$$CDM cosmology). If this component of decaying dark matter is cold, however, it will modify the evolution of the gravitational potentials, leading to inconsistencies with these same data sets. As such, we consider here a component of decaying warm dark matter, with a free-streaming length that is long enough to remain consistent with existing data. We study the background and perturbation evolution of warm decaying dark matter, and use cosmological data to constrain the mass, abundance and decay rate of such a particle. We find that a component of warm decaying dark matter can significantly reduce the tension between local and cosmological determinations of the Hubble constant.
- Authors:
-
[3]
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Univ. of Chicago, IL (United States). Kavli Inst. for Cosmological Physics (KICP)
- Univ. of Chicago, IL (United States). Kavli Inst. for Cosmological Physics (KICP) and Dept. of Astronomy and Astrophysics
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Univ. of Chicago, IL (United States). Kavli Inst. for Cosmological Physics (KICP) and Dept. of Astronomy and Astrophysics
- Publication Date:
- Research Org.:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP); National Institute for Nuclear Physics (INFN); National Science Foundation (NSF)
- OSTI Identifier:
- 1617225
- Report Number(s):
- arXiv:2004.06114; FERMILAB-PUB-20-152-A
Journal ID: ISSN 1475-7516; oai:inspirehep.net:1791155; TRN: US2106734
- Grant/Contract Number:
- AC02-07CH11359; DGE-1746045
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Cosmology and Astroparticle Physics
- Additional Journal Information:
- Journal Volume: 2020; Journal Issue: 06; Journal ID: ISSN 1475-7516
- Publisher:
- Institute of Physics (IOP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; cosmology of theories beyond the SM; cosmological parameters from CMBR; cosmological parameters from LSS; dark matter theory
Citation Formats
Blinov, Nikita, Keith, Celeste, and Hooper, Dan. Warm decaying dark matter and the hubble tension. United States: N. p., 2020.
Web. doi:10.1088/1475-7516/2020/06/005.
Blinov, Nikita, Keith, Celeste, & Hooper, Dan. Warm decaying dark matter and the hubble tension. United States. https://doi.org/10.1088/1475-7516/2020/06/005
Blinov, Nikita, Keith, Celeste, and Hooper, Dan. Wed .
"Warm decaying dark matter and the hubble tension". United States. https://doi.org/10.1088/1475-7516/2020/06/005. https://www.osti.gov/servlets/purl/1617225.
@article{osti_1617225,
title = {Warm decaying dark matter and the hubble tension},
author = {Blinov, Nikita and Keith, Celeste and Hooper, Dan},
abstractNote = {If a fraction of the dark matter is unstable and decays into dark radiation at around the time of matter-radiation equality, it could impact the expansion history of the universe in a way that helps to ameliorate the long-standing tension between the locally measured value of the Hubble constant and the value inferred from measurements of the cosmic microwave background and baryon acoustic oscillations (assuming standard $\Lambda$CDM cosmology). If this component of decaying dark matter is cold, however, it will modify the evolution of the gravitational potentials, leading to inconsistencies with these same data sets. As such, we consider here a component of decaying warm dark matter, with a free-streaming length that is long enough to remain consistent with existing data. We study the background and perturbation evolution of warm decaying dark matter, and use cosmological data to constrain the mass, abundance and decay rate of such a particle. We find that a component of warm decaying dark matter can significantly reduce the tension between local and cosmological determinations of the Hubble constant.},
doi = {10.1088/1475-7516/2020/06/005},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 06,
volume = 2020,
place = {United States},
year = {Wed Jun 03 00:00:00 EDT 2020},
month = {Wed Jun 03 00:00:00 EDT 2020}
}
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