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Title: Mixed axion/neutralino dark matter in the SUSY DFSZ axion model

Abstract

We examine mixed axion/neutralino cold dark matter production in the SUSY DFSZ axion model where an axion superfield couples to Higgs superfields. We calculate a wide array of axino and saxion decay modes along with their decay temperatures, and thermal and non-thermal production rates. For a SUSY benchmark model with a standard underabundance (SUA) of Higgsino-like dark matter (DM), we find for the PQ scale f{sub a}∼<10{sup 12} GeV that the DM abundance is mainly comprised of axions as the saxion/axino decay occurs before the standard neutralino freeze-out and thus its abundance remains suppressed. For 10{sup 12}∼10{sup 14} GeV, both neutralino dark matter and dark radiation are typically overproduced. For judicious parameter choices, these can be suppressed and the combined neutralino/axion abundance brought into accord with measured values. A SUSY benchmark model with a standard overabundance (SOA) of bino DM is also examined and typically remains excluded due at least to too great a neutralino DM abundance for f{sub a}∼<10{sup 15} GeV. For f{sub a}∼>10{sup 15} GeV and lower saxion masses, large entropy production from saxion decay can dilute all relics and the SOA model can be allowed by all constraints.

Authors:
;  [1]
  1. Department of Physics and Astronomy, University of Oklahoma, Norman, OK 73019 (United States)
Publication Date:
OSTI Identifier:
22369860
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2013; Journal Issue: 12; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANNIHILATION; AXIONS; ENTROPY; GEV RANGE; HIGGS BOSONS; HIGGS MODEL; MASS; NONLUMINOUS MATTER; PARTICLE DECAY; SUPERSYMMETRY

Citation Formats

Bae, Kyu Jung, Baer, Howard, and Chun, Eung Jin, E-mail: bae@nhn.ou.edu, E-mail: baer@nhn.ou.edu, E-mail: ejchun@kias.re.kr. Mixed axion/neutralino dark matter in the SUSY DFSZ axion model. United States: N. p., 2013. Web. doi:10.1088/1475-7516/2013/12/028.
Bae, Kyu Jung, Baer, Howard, & Chun, Eung Jin, E-mail: bae@nhn.ou.edu, E-mail: baer@nhn.ou.edu, E-mail: ejchun@kias.re.kr. Mixed axion/neutralino dark matter in the SUSY DFSZ axion model. United States. https://doi.org/10.1088/1475-7516/2013/12/028
Bae, Kyu Jung, Baer, Howard, and Chun, Eung Jin, E-mail: bae@nhn.ou.edu, E-mail: baer@nhn.ou.edu, E-mail: ejchun@kias.re.kr. Sun . "Mixed axion/neutralino dark matter in the SUSY DFSZ axion model". United States. https://doi.org/10.1088/1475-7516/2013/12/028.
@article{osti_22369860,
title = {Mixed axion/neutralino dark matter in the SUSY DFSZ axion model},
author = {Bae, Kyu Jung and Baer, Howard and Chun, Eung Jin, E-mail: bae@nhn.ou.edu, E-mail: baer@nhn.ou.edu, E-mail: ejchun@kias.re.kr},
abstractNote = {We examine mixed axion/neutralino cold dark matter production in the SUSY DFSZ axion model where an axion superfield couples to Higgs superfields. We calculate a wide array of axino and saxion decay modes along with their decay temperatures, and thermal and non-thermal production rates. For a SUSY benchmark model with a standard underabundance (SUA) of Higgsino-like dark matter (DM), we find for the PQ scale f{sub a}∼<10{sup 12} GeV that the DM abundance is mainly comprised of axions as the saxion/axino decay occurs before the standard neutralino freeze-out and thus its abundance remains suppressed. For 10{sup 12}∼10{sup 14} GeV, both neutralino dark matter and dark radiation are typically overproduced. For judicious parameter choices, these can be suppressed and the combined neutralino/axion abundance brought into accord with measured values. A SUSY benchmark model with a standard overabundance (SOA) of bino DM is also examined and typically remains excluded due at least to too great a neutralino DM abundance for f{sub a}∼<10{sup 15} GeV. For f{sub a}∼>10{sup 15} GeV and lower saxion masses, large entropy production from saxion decay can dilute all relics and the SOA model can be allowed by all constraints.},
doi = {10.1088/1475-7516/2013/12/028},
url = {https://www.osti.gov/biblio/22369860}, journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 12,
volume = 2013,
place = {United States},
year = {2013},
month = {12}
}