Journal
PHYSICS LETTERS B
Volume 801, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2019.135136
Keywords
-
Funding
- INFN
- National Science Foundation [NSF PHY17-48958]
- NSF [PHY-0855591, PHY-1216270]
- NASA ATP Grant [NNX16AI12G]
- DOE [DE-SC0013607]
- JSPS KAKENHI [JP15H05889, JP15K21733, JP17H02878, JP17H02875, JP15H02082, JP18H04339, JP18K03640]
- Leading Young Researcher Overseas Visit Program at Tohoku University
- WPI Initiative, MEXT, Japan
- Simons Foundation [341344]
- JSPS [17J09736]
- Grants-in-Aid for Scientific Research [17J09736] Funding Source: KAKEN
- NASA [NNX16AI12G, 903810] Funding Source: Federal RePORTER
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We present a new mechanism for producing the correct relic abundance of dark photon dark matter over a wide range of its mass, extending down to 10(-20) eV. The dark matter abundance is initially stored in an axion which is misaligned from its minimum. When the axion starts oscillating, it efficiently transfers its energy into dark photons via a tachyonic instability. If the dark photon mass is within a few orders of magnitude of the axion mass, m(gamma')/m(alpha) = O(10(-3) - 1), then dark photons make up the dominant form of dark matter today. We present a numerical lattice simulation for a benchmark model that explicitly realizes our mechanism. This mechanism firms up the motivation for a number of experiments searching for dark photon dark matter. (C) 2019 The Authors. Published by Elsevier B.V.
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