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Common origin of warm dark matter and dark radiation

Journal Article · · Journal of Cosmology and Astroparticle Physics
 [1];  [2];  [3]
  1. Brown Univ., Providence, RI (United States); Institute for Advanced Study
  2. Univ. of Michigan, Ann Arbor, MI (United States)
  3. Institute for Advanced Study, Princeton, NJ (United States)
We consider a cosmological scenario where a relativistic particle and a stable massive particle are simultaneously produced from the decay of a late-decaying particle after Big-Bang Nucleosynthesis but before matter-radiation equality. The relativistic and massive particles behave as dark radiation and warm dark matter, respectively. Due to a common origin, the warmness and abundances are closely related. We refer to the models that lead to such a scenario as Common Origin of Warm and Relativistic Decay Products (COWaRD). We show that COWaRD predicts a correlation between the amount of dark radiation and suppression of the large scale structure, which can be tested in future precision cosmology observations. Furthermore, we demonstrate that COWaRD is realized, as an example, in a class of supersymmetric axion models and that future observations by the next generation Cosmic Microwave Background, Large Scale Structure, and 21-cm surveys can reveal the structure of the theory.
Research Organization:
Institute for Advanced Study, Princeton, NJ (United States)
Sponsoring Organization:
NASA; USDOE Office of Science (SC)
Grant/Contract Number:
SC0009988; SC0019225
OSTI ID:
1879867
Alternate ID(s):
OSTI ID: 1851259
OSTI ID: 23041567
Journal Information:
Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 12 Vol. 2020; ISSN 1475-7516
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

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