Astrophysical probes of inelastic dark matter with a light mediator
Abstract
We consider an inelastic dark matter model, in which a fermion is charged under a broken U(1) gauge symmetry, and introduce a tiny Majorana mass term to split the fermion into two states with the light one being a dark matter candidate. If the gauge boson is light, it can mediate both elastic and inelastic dark matter self-interactions in dark halos, leading to observational consequences. Using a numerical technique based on partial wave analysis, we accurately calculate the elastic and inelastic self-scattering cross sections. We assume a thermal freeze-out scenario and fix the gauge coupling constant using the relic density constraint. Then, we focus on six benchmark masses of dark matter, covering a wide range from 10 MeV to 160 GeV and map parameter regions where the elastic scattering cross section per unit mass is within 1 cm2/g ₋ 5 cm2/g, favored to solve small-scale issues of cold dark matter. If the heavy state can decay to the light state and a massless species, the inelastic up-scattering process can cool the halo and lead to core collapse. Taking galaxies with evidence of dark matter density cores, we further derive constraints on the parameter space. For dark matter masses below 10more »
- Publication Date:
- Research Org.:
- Univ. of California, Riverside, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1598072
- Alternate Identifier(s):
- OSTI ID: 1801829
- Grant/Contract Number:
- de-sc0008541; SC0008541
- Resource Type:
- Published Article
- Journal Name:
- Physical Review D
- Additional Journal Information:
- Journal Name: Physical Review D Journal Volume: 101 Journal Issue: 4; Journal ID: ISSN 2470-0010
- Publisher:
- American Physical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Astronomy & Astrophysics; Physics
Citation Formats
Alvarez, Gerardo, and Yu, Hai-Bo. Astrophysical probes of inelastic dark matter with a light mediator. United States: N. p., 2020.
Web. doi:10.1103/PhysRevD.101.043002.
Alvarez, Gerardo, & Yu, Hai-Bo. Astrophysical probes of inelastic dark matter with a light mediator. United States. https://doi.org/10.1103/PhysRevD.101.043002
Alvarez, Gerardo, and Yu, Hai-Bo. Thu .
"Astrophysical probes of inelastic dark matter with a light mediator". United States. https://doi.org/10.1103/PhysRevD.101.043002.
@article{osti_1598072,
title = {Astrophysical probes of inelastic dark matter with a light mediator},
author = {Alvarez, Gerardo and Yu, Hai-Bo},
abstractNote = {We consider an inelastic dark matter model, in which a fermion is charged under a broken U(1) gauge symmetry, and introduce a tiny Majorana mass term to split the fermion into two states with the light one being a dark matter candidate. If the gauge boson is light, it can mediate both elastic and inelastic dark matter self-interactions in dark halos, leading to observational consequences. Using a numerical technique based on partial wave analysis, we accurately calculate the elastic and inelastic self-scattering cross sections. We assume a thermal freeze-out scenario and fix the gauge coupling constant using the relic density constraint. Then, we focus on six benchmark masses of dark matter, covering a wide range from 10 MeV to 160 GeV and map parameter regions where the elastic scattering cross section per unit mass is within 1 cm2/g ₋ 5 cm2/g, favored to solve small-scale issues of cold dark matter. If the heavy state can decay to the light state and a massless species, the inelastic up-scattering process can cool the halo and lead to core collapse. Taking galaxies with evidence of dark matter density cores, we further derive constraints on the parameter space. For dark matter masses below 10 GeV, the mass splitting must be large enough to forbid up scattering in the dwarf halo for evading the core-collapse constraint; while for higher masses, the up-scattering process can still be allowed. Our results show astrophysical observations can provide powerful tests for dark matter models with large elastic and inelastic self-interactions.},
doi = {10.1103/PhysRevD.101.043002},
journal = {Physical Review D},
number = 4,
volume = 101,
place = {United States},
year = {2020},
month = {2}
}
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