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Title: Addressing astrophysical and cosmological problems with secretly asymmetric dark matter

Abstract

We present a simple model of dark matter that can address astrophysical and cosmological puzzles across a wide range of scales. The model is an application of the secretly asymmetric dark matter mechanism, where several flavors of dark matter are fully asymmetric despite an exact dark matter number symmetry U(1)χ. The dark matter relic abundance arises from these asymmetries, generated in the early Universe through right-handed neutrino decays. The U(1)χ is gauged by a massless dark photon, and asymmetries with opposite signs in the different DM flavors result in the formation of bound states. Dark acoustic oscillations in the early Universe lead to a suppression in the matter power spectrum for addressing the σ8 problem. The dark photon as a relativistic degree of freedom contributes to ΔNeff, easing the tension between the cosmic microwave background and low redshift H0 measurements. Finally, scattering between the bound states after structure formation leads to a flattening of the dark matter distribution at the cores of haloes.

Authors:
; ; ;
Publication Date:
Research Org.:
Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Foundation (NSF)
OSTI Identifier:
1543179
Alternate Identifier(s):
OSTI ID: 1613148
Grant/Contract Number:  
SC0019225; PHY-1620610; PHY-1607611
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Name: Physical Review D Journal Volume: 100 Journal Issue: 1; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Astronomy & Astrophysics; Physics; Baryogenesis & leptogenesis; Cosmology; Large scale structure of the Universe; Particle dark matter

Citation Formats

Dessert, Christopher, Kilic, Can, Trendafilova, Cynthia, and Tsai, Yuhsin. Addressing astrophysical and cosmological problems with secretly asymmetric dark matter. United States: N. p., 2019. Web. doi:10.1103/PhysRevD.100.015029.
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Dessert, Christopher, Kilic, Can, Trendafilova, Cynthia, & Tsai, Yuhsin. Addressing astrophysical and cosmological problems with secretly asymmetric dark matter. United States. https://doi.org/10.1103/PhysRevD.100.015029
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Dessert, Christopher, Kilic, Can, Trendafilova, Cynthia, and Tsai, Yuhsin. Fri . "Addressing astrophysical and cosmological problems with secretly asymmetric dark matter". United States. https://doi.org/10.1103/PhysRevD.100.015029.
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@article{osti_1543179,
title = {Addressing astrophysical and cosmological problems with secretly asymmetric dark matter},
author = {Dessert, Christopher and Kilic, Can and Trendafilova, Cynthia and Tsai, Yuhsin},
abstractNote = {We present a simple model of dark matter that can address astrophysical and cosmological puzzles across a wide range of scales. The model is an application of the secretly asymmetric dark matter mechanism, where several flavors of dark matter are fully asymmetric despite an exact dark matter number symmetry U(1)χ. The dark matter relic abundance arises from these asymmetries, generated in the early Universe through right-handed neutrino decays. The U(1)χ is gauged by a massless dark photon, and asymmetries with opposite signs in the different DM flavors result in the formation of bound states. Dark acoustic oscillations in the early Universe lead to a suppression in the matter power spectrum for addressing the σ8 problem. The dark photon as a relativistic degree of freedom contributes to ΔNeff, easing the tension between the cosmic microwave background and low redshift H0 measurements. Finally, scattering between the bound states after structure formation leads to a flattening of the dark matter distribution at the cores of haloes.},
doi = {10.1103/PhysRevD.100.015029},
journal = {Physical Review D},
number = 1,
volume = 100,
place = {United States},
year = {2019},
month = {7}
}
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https://doi.org/10.1103/PhysRevD.100.015029
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