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Title: Dynamics of millicharged dark matter in supernova remnants

Abstract

Dark matter could have a small electromagnetic charge, provided the charge-to-mass ratio is much less than that of electrons or protons. This candidate, commonly known as millicharged dark matter (mDM), would form a plasma and interact with the interstellar medium and electromagnetic fields within galaxies. In general, understanding the dynamics of mDM requires consideration of collective plasma effects. It has been proposed that mDM can be accelerated in supernova remnants, forming a dark cosmic ray population that would leave distinct experimental signatures. In this work, we study a microphysical model where mDM is shocked by a supernova remnant and isotropized in the frame of the expanding fluid. We find that for | q χ / m χ | 10 13 e / MeV , the isotropization length for electromagnetic plasma instabilities is much shorter than the size of the supernova remnant. This is a necessary, though not sufficient, first step for formation of a Fermi-accelerated mDM component, and determining the size of this component requires further study. Finally, we discuss additional implications of mDM interactions in supernova remnants.

Authors:
ORCiD logo [1]; ORCiD logo [1]
  1. Univ. of California, San Diego, CA (United States)
Publication Date:
Research Org.:
Univ. of California, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP); Government of Taiwan
OSTI Identifier:
1657813
Grant/Contract Number:  
SC0019195
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 101; Journal Issue: 10; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Li, Jung-Tsung, and Lin, Tongyan. Dynamics of millicharged dark matter in supernova remnants. United States: N. p., 2020. Web. https://doi.org/10.1103/physrevd.101.103034.
Li, Jung-Tsung, & Lin, Tongyan. Dynamics of millicharged dark matter in supernova remnants. United States. https://doi.org/10.1103/physrevd.101.103034
Li, Jung-Tsung, and Lin, Tongyan. Wed . "Dynamics of millicharged dark matter in supernova remnants". United States. https://doi.org/10.1103/physrevd.101.103034. https://www.osti.gov/servlets/purl/1657813.
@article{osti_1657813,
title = {Dynamics of millicharged dark matter in supernova remnants},
author = {Li, Jung-Tsung and Lin, Tongyan},
abstractNote = {Dark matter could have a small electromagnetic charge, provided the charge-to-mass ratio is much less than that of electrons or protons. This candidate, commonly known as millicharged dark matter (mDM), would form a plasma and interact with the interstellar medium and electromagnetic fields within galaxies. In general, understanding the dynamics of mDM requires consideration of collective plasma effects. It has been proposed that mDM can be accelerated in supernova remnants, forming a dark cosmic ray population that would leave distinct experimental signatures. In this work, we study a microphysical model where mDM is shocked by a supernova remnant and isotropized in the frame of the expanding fluid. We find that for |qχ/mχ|≳10–13e/MeV, the isotropization length for electromagnetic plasma instabilities is much shorter than the size of the supernova remnant. This is a necessary, though not sufficient, first step for formation of a Fermi-accelerated mDM component, and determining the size of this component requires further study. Finally, we discuss additional implications of mDM interactions in supernova remnants.},
doi = {10.1103/physrevd.101.103034},
journal = {Physical Review D},
number = 10,
volume = 101,
place = {United States},
year = {2020},
month = {5}
}

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