Gravitino/axino as decaying dark matter and cosmological tensions

Gravitino/axino as decaying dark matter and cosmological tensions

In supersymmetric axion models, if the gravitino or axino is the lightest SUSY particle (LSP), the other is often the next-to-LSP (NLSP). We investigate the cosmology of such a scenario and point out that the lifetime of the NLSP naturally becomes comparable to the present age of the universe in a v...

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Main Authors: Koichi Hamaguchi, Kazunori Nakayama, Yong Tang
Format: Article
Language:English
Published: Elsevier 2017-09-01
Series:Physics Letters B
Online Access:http://www.sciencedirect.com/science/article/pii/S0370269317305476
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spelling doaj-08d19b332cc6497d9e63699ca1ad22a02020-11-24T23:24:50ZengElsevierPhysics Letters B0370-26931873-24452017-09-01772C41541910.1016/j.physletb.2017.06.071Gravitino/axino as decaying dark matter and cosmological tensionsKoichi Hamaguchi0Kazunori Nakayama1Yong Tang2Department of Physics, Faculty of Science, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, JapanDepartment of Physics, Faculty of Science, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, JapanDepartment of Physics, Faculty of Science, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, JapanIn supersymmetric axion models, if the gravitino or axino is the lightest SUSY particle (LSP), the other is often the next-to-LSP (NLSP). We investigate the cosmology of such a scenario and point out that the lifetime of the NLSP naturally becomes comparable to the present age of the universe in a viable parameter region. This is a well-motivated example of the so-called decaying dark matter model, which is recently considered as an extension of the ΛCDM model to relax some cosmological tensions.http://www.sciencedirect.com/science/article/pii/S0370269317305476
collection DOAJ
language English
format Article
sources DOAJ
author Koichi Hamaguchi
Kazunori Nakayama
Yong Tang
spellingShingle Koichi Hamaguchi
Kazunori Nakayama
Yong Tang
Gravitino/axino as decaying dark matter and cosmological tensions
Physics Letters B
author_facet Koichi Hamaguchi
Kazunori Nakayama
Yong Tang
author_sort Koichi Hamaguchi
title Gravitino/axino as decaying dark matter and cosmological tensions
title_short Gravitino/axino as decaying dark matter and cosmological tensions
title_full Gravitino/axino as decaying dark matter and cosmological tensions
title_fullStr Gravitino/axino as decaying dark matter and cosmological tensions
title_full_unstemmed Gravitino/axino as decaying dark matter and cosmological tensions
title_sort gravitino/axino as decaying dark matter and cosmological tensions
publisher Elsevier
series Physics Letters B
issn 0370-2693
1873-2445
publishDate 2017-09-01
description In supersymmetric axion models, if the gravitino or axino is the lightest SUSY particle (LSP), the other is often the next-to-LSP (NLSP). We investigate the cosmology of such a scenario and point out that the lifetime of the NLSP naturally becomes comparable to the present age of the universe in a viable parameter region. This is a well-motivated example of the so-called decaying dark matter model, which is recently considered as an extension of the ΛCDM model to relax some cosmological tensions.
url http://www.sciencedirect.com/science/article/pii/S0370269317305476
work_keys_str_mv AT koichihamaguchi gravitinoaxinoasdecayingdarkmatterandcosmologicaltensions
AT kazunorinakayama gravitinoaxinoasdecayingdarkmatterandcosmologicaltensions
AT yongtang gravitinoaxinoasdecayingdarkmatterandcosmologicaltensions
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