論文

査読有り 本文へのリンクあり
2017年5月

The ALP miracle : unified inflaton and dark matter

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
  • Ryuji Daido
  • ,
  • Fuminobu Takahashi
  • ,
  • Wen Yin

担当区分
責任著者
5
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1088/1475-7516/2017/05/044
出版者・発行元
IOP PUBLISHING LTD

We propose a scenario where both inflation and dark matter are described by a single axion-like particle (ALP) in a unified manner. In a class of the minimal axion hilltop inflation, the effective masses at the maximum and mimimum of the potential have equal magnitude but opposite sign, so that the ALP inflaton is light both during inflation and in the true vacuum. After inflation, most of the ALPs decay and evaporate into plasma through a coupling to photons, and the remaining ones become dark matter. We find that the observed CMB and matter power spectrum as well as the dark matter abundance point to an ALP of mass m(phi) = O(0.01) eV and the axion-photon coupling g(phi gamma gamma) = O(10(-11)) GeV-1 : the ALP miracle. The suggested parameter region is within the reach of the next generation axion helioscope, IAXO, and high-intensity laser experiments in the future. Furthermore, thermalized ALPs contribute to hot dark matter and its abundance is given in terms of the effective number of extra neutrino species, Delta N-eff similar or equal to 0.03, which can be tested by the future CMB and BAO observations. We also discuss a case with multiple ALPs, where the coupling to photons can be enhanced in the early Universe by an order of magnitude or more, which enlarges the parameter space for the ALP miracle. The heavy ALP plays a role of the waterfall field in hybrid inflation, and reheats the Universe, and it can be searched for in various experiments such as SHiP.

Web of Science ® 被引用回数 : 34

リンク情報
DOI
https://doi.org/10.1088/1475-7516/2017/05/044
arXiv
http://arxiv.org/abs/arXiv:1702.03284
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000402878200044&DestApp=WOS_CPL
Arxiv Url
http://arxiv.org/abs/1702.03284v3
Arxiv Url
http://arxiv.org/pdf/1702.03284v3 本文へのリンクあり

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