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Title: Magnetic field transfer from a hidden sector

Abstract

Primordial magnetic fields in the dark sector can be transferred to magnetic fields in the visible sector due to a gauge kinetic mixing term.We show that the transfer occurs when the evolution of magnetic fields is dominated by dissipation due to finite electric conductivity, and does not occur at later times if the magnetic fields evolve according to magnetohydrodynamics scaling laws. The efficiency of the transfer is suppressed by not only the gauge kinetic mixing coupling but also the ratio between the large electric conductivity and the typical momentum of the magnetic fields. We find that the transfer gives nonzero visible magnetic fields today. Furthermore, without possible dynamo amplifications, the field transfer is not efficient enough to obtain the intergalactic magnetic fields suggested by the gamma-ray observations, although there are plenty of possibilities for efficient dark magnetogenesis, which are experimentally unconstrained.

Authors:
; ;
Publication Date:
Research Org.:
Arizona State Univ., Tempe, AZ (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1462451
Alternate Identifier(s):
OSTI ID: 1503872
Grant/Contract Number:  
SC0013605
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Name: Physical Review D Journal Volume: 98 Journal Issue: 4; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Kamada, Kohei, Tsai, Yuhsin, and Vachaspati, Tanmay. Magnetic field transfer from a hidden sector. United States: N. p., 2018. Web. doi:10.1103/PhysRevD.98.043501.
Kamada, Kohei, Tsai, Yuhsin, & Vachaspati, Tanmay. Magnetic field transfer from a hidden sector. United States. doi:10.1103/PhysRevD.98.043501.
Kamada, Kohei, Tsai, Yuhsin, and Vachaspati, Tanmay. Wed . "Magnetic field transfer from a hidden sector". United States. doi:10.1103/PhysRevD.98.043501.
@article{osti_1462451,
title = {Magnetic field transfer from a hidden sector},
author = {Kamada, Kohei and Tsai, Yuhsin and Vachaspati, Tanmay},
abstractNote = {Primordial magnetic fields in the dark sector can be transferred to magnetic fields in the visible sector due to a gauge kinetic mixing term.We show that the transfer occurs when the evolution of magnetic fields is dominated by dissipation due to finite electric conductivity, and does not occur at later times if the magnetic fields evolve according to magnetohydrodynamics scaling laws. The efficiency of the transfer is suppressed by not only the gauge kinetic mixing coupling but also the ratio between the large electric conductivity and the typical momentum of the magnetic fields. We find that the transfer gives nonzero visible magnetic fields today. Furthermore, without possible dynamo amplifications, the field transfer is not efficient enough to obtain the intergalactic magnetic fields suggested by the gamma-ray observations, although there are plenty of possibilities for efficient dark magnetogenesis, which are experimentally unconstrained.},
doi = {10.1103/PhysRevD.98.043501},
journal = {Physical Review D},
number = 4,
volume = 98,
place = {United States},
year = {2018},
month = {8}
}

Journal Article:
Free Publicly Available Full Text
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DOI: 10.1103/PhysRevD.98.043501

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