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Title: New Limits on Charged Dark Matter from Large-Scale Coherent Magnetic Fields

Abstract

We study the interaction of an electrically charged component of the dark matter with a magnetized galactic interstellar medium (ISM) of (rotating) spiral galaxies. For the observed ordered component of the field, $$B\sim \mu$$G, we find that the accumulated Lorentz interactions between the charged particles and the ISM will extract an order unity fraction of the disk angular momentum over the few Gyr Galactic lifetime unless $$q/e \lesssim 10^{-13\pm 1}\,m\,c^2/$$ GeV if all the dark matter is charged. The bound is weakened by factor $$f_{\rm qdm}^{-1/2}$$ if only a mass fraction $$f_{\rm qdm}\gtrsim0.13$$ of the dark matter is charged. Here $q$ and $m$ are the dark matter particle mass and charge. If $$f_{\rm qdm}\approx1$$ this bound excludes charged dark matter produced via the freeze-in mechanism for $$m \lesssim$$ TeV/$c^2$. This bound on $q/m$, obtained from Milky Way parameters, is rough and not based on any precise empirical test. However this bound is extremely strong and should motivate further work to better model the interaction of charged dark matter with ordered and disordered magnetic fields in galaxies and clusters of galaxies; to develop precise tests for the presence of charged dark matter based on better estimates of angular momentum exchange; and also to better understand how charged dark matter might modify the growth of magnetic fields, and the formation and interaction histories of galaxies, galaxy groups, and clusters.

Authors:
 [1];  [1]
  1. Fermilab
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1561542
Report Number(s):
arXiv:1908.05275; FERMILAB-PUB-19-271-A
oai:inspirehep.net:1749776
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Journal Name:
TBD
Additional Journal Information:
Journal Name: TBD
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Stebbins, Albert, and Krnjaic, Gordan. New Limits on Charged Dark Matter from Large-Scale Coherent Magnetic Fields. United States: N. p., 2019. Web.
Stebbins, Albert, & Krnjaic, Gordan. New Limits on Charged Dark Matter from Large-Scale Coherent Magnetic Fields. United States.
Stebbins, Albert, and Krnjaic, Gordan. Wed . "New Limits on Charged Dark Matter from Large-Scale Coherent Magnetic Fields". United States. https://www.osti.gov/servlets/purl/1561542.
@article{osti_1561542,
title = {New Limits on Charged Dark Matter from Large-Scale Coherent Magnetic Fields},
author = {Stebbins, Albert and Krnjaic, Gordan},
abstractNote = {We study the interaction of an electrically charged component of the dark matter with a magnetized galactic interstellar medium (ISM) of (rotating) spiral galaxies. For the observed ordered component of the field, $B\sim \mu$G, we find that the accumulated Lorentz interactions between the charged particles and the ISM will extract an order unity fraction of the disk angular momentum over the few Gyr Galactic lifetime unless $q/e \lesssim 10^{-13\pm 1}\,m\,c^2/$ GeV if all the dark matter is charged. The bound is weakened by factor $f_{\rm qdm}^{-1/2}$ if only a mass fraction $f_{\rm qdm}\gtrsim0.13$ of the dark matter is charged. Here $q$ and $m$ are the dark matter particle mass and charge. If $f_{\rm qdm}\approx1$ this bound excludes charged dark matter produced via the freeze-in mechanism for $m \lesssim$ TeV/$c^2$. This bound on $q/m$, obtained from Milky Way parameters, is rough and not based on any precise empirical test. However this bound is extremely strong and should motivate further work to better model the interaction of charged dark matter with ordered and disordered magnetic fields in galaxies and clusters of galaxies; to develop precise tests for the presence of charged dark matter based on better estimates of angular momentum exchange; and also to better understand how charged dark matter might modify the growth of magnetic fields, and the formation and interaction histories of galaxies, galaxy groups, and clusters.},
doi = {},
journal = {TBD},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {8}
}