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Title: Plasma constraints on the cosmological abundance of magnetic monopoles and the origin of cosmic magnetic fields

Abstract

Existing theoretical and observational constraints on the abundance of magnetic monopoles are limited. Here we demonstrate that an ensemble of monopoles forms a plasma whose properties are well determined and whose collective effects place new tight constraints on the cosmological abundance of monopoles. In particular, the existence of micro-Gauss magnetic fields in galaxy clusters and radio relics implies that the scales of these structures are below the Debye screening length, thus setting an upper limit on the cosmological density parameter of monopoles, Ω {sub M} {sub ∼<} {sub 3} {sub ×} {sub 10}{sup −4}, which precludes them from being the dark matter. Future detection of Gpc-scale coherent magnetic fields could improve this limit by a few orders of magnitude. In addition, we predict the existence of magnetic Langmuir waves and turbulence which may appear on the sky as ''zebra patterns'' of an alternating magnetic field with k·B ≠ 0. We also show that magnetic monopole Langmuir turbulence excited near the accretion shock of galaxy clusters may be an efficient mechanism for generating the observed intracluster magnetic fields.

Authors:
;  [1]
  1. Department of Astronomy, Harvard University, Cambridge, MA 02138 (United States)
Publication Date:
OSTI Identifier:
22676129
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2017; Journal Issue: 06; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABUNDANCE; DENSITY; DETECTION; GALAXIES; GALAXY CLUSTERS; INTERSTELLAR MAGNETIC FIELDS; MAGNETIC FIELDS; MAGNETIC MONOPOLES; NONLUMINOUS MATTER; PLASMA; SCREENING; TURBULENCE

Citation Formats

Medvedev, Mikhail V., and Loeb, Abraham, E-mail: mmedvedev@cfa.harvard.edu, E-mail: aloeb@cfa.harvard.edu. Plasma constraints on the cosmological abundance of magnetic monopoles and the origin of cosmic magnetic fields. United States: N. p., 2017. Web. doi:10.1088/1475-7516/2017/06/058.
Medvedev, Mikhail V., & Loeb, Abraham, E-mail: mmedvedev@cfa.harvard.edu, E-mail: aloeb@cfa.harvard.edu. Plasma constraints on the cosmological abundance of magnetic monopoles and the origin of cosmic magnetic fields. United States. doi:10.1088/1475-7516/2017/06/058.
Medvedev, Mikhail V., and Loeb, Abraham, E-mail: mmedvedev@cfa.harvard.edu, E-mail: aloeb@cfa.harvard.edu. Thu . "Plasma constraints on the cosmological abundance of magnetic monopoles and the origin of cosmic magnetic fields". United States. doi:10.1088/1475-7516/2017/06/058.
@article{osti_22676129,
title = {Plasma constraints on the cosmological abundance of magnetic monopoles and the origin of cosmic magnetic fields},
author = {Medvedev, Mikhail V. and Loeb, Abraham, E-mail: mmedvedev@cfa.harvard.edu, E-mail: aloeb@cfa.harvard.edu},
abstractNote = {Existing theoretical and observational constraints on the abundance of magnetic monopoles are limited. Here we demonstrate that an ensemble of monopoles forms a plasma whose properties are well determined and whose collective effects place new tight constraints on the cosmological abundance of monopoles. In particular, the existence of micro-Gauss magnetic fields in galaxy clusters and radio relics implies that the scales of these structures are below the Debye screening length, thus setting an upper limit on the cosmological density parameter of monopoles, Ω {sub M} {sub ∼<} {sub 3} {sub ×} {sub 10}{sup −4}, which precludes them from being the dark matter. Future detection of Gpc-scale coherent magnetic fields could improve this limit by a few orders of magnitude. In addition, we predict the existence of magnetic Langmuir waves and turbulence which may appear on the sky as ''zebra patterns'' of an alternating magnetic field with k·B ≠ 0. We also show that magnetic monopole Langmuir turbulence excited near the accretion shock of galaxy clusters may be an efficient mechanism for generating the observed intracluster magnetic fields.},
doi = {10.1088/1475-7516/2017/06/058},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 06,
volume = 2017,
place = {United States},
year = {Thu Jun 01 00:00:00 EDT 2017},
month = {Thu Jun 01 00:00:00 EDT 2017}
}