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Late-Time Magnetogenesis Driven by Axionlike Particle Dark Matter and a Dark Photon

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Title
Late-Time Magnetogenesis Driven by Axionlike Particle Dark Matter and a Dark Photon
Author(s)
Kiwoon Choi; Hyungjin Kim; Toyokazu Sekiguchi
Publication Date
2018-07
Journal
PHYSICAL REVIEW LETTERS, v.121, no.3, pp.031102 -
Publisher
AMER PHYSICAL SOC
Abstract
We propose a mechanism generating primordial magnetic fields after the e(+)e(-) annihilations. Our mechanism involves an ultralight axionlike particle (ALP) which constitutes the dark matter and a dark U(1)(X) gauge boson introduced to bypass the obstacle placed by the conductivity of cosmic plasma. In our scheme, a coherently oscillating ALP amplifies the dark photon field, and part of the amplified dark photon field is concurrently converted to the ordinary magnetic field through the ALP-induced magnetic mixing. For the relevant ALP mass range 10(-21) eV less than or similar to m(phi) <= 10(-17) eV, our mechanism can generate B similar to 10(-24) G(m(phi)/10(-17) eV)(5/4) with a coherent length lambda similar to (m(phi)/10(-17) eV)(-1/2) kpc, which is large enough to provide a seed of the galactic magnetic fields. The mechanism also predicts a dark U(1)(X) electromagnetic field E-X similar to B-X similar to 80 nG(m(phi)/10(-17) eV)(-1/4), which can result in interesting astrophysical or cosmological phenomena by inducing the mixings between the ALP, ordinary photon, and dark photon states ⓒ2018 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/4963
ISSN
0031-9007
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > Journal Papers (저널논문)
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