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Title: Dark Grand Unification in the axiverse: decaying axion dark matter and spontaneous baryogenesis

Abstract

The quantum chromodynamics axion with a decay constant near the Grand Unification (GUT) scale has an ultralight mass near a neV. We show, however, that axion-like particles with masses near the keV–PeV range with GUT-scale decay constants are also well motivated in that they naturally arise from axiverse theories with dark c gauge groups. We demonstrate that the correct dark matter abundance may be achieved by the heavy axions in these models through the misalignment mechanism in combination with a period of early matter domination from the long-lived dark glueballs of the same gauge group. Heavy axion dark matter may decay to two photons, yielding mono-energetic electromagnetic signatures that may be detectable by current or next-generation space-based telescopes. We project the sensitivity of next-generation telescopes including Athena, AMEGO, and e-ASTROGAM to such decaying axion dark matter. If the dark sector contains multiple confining gauge groups, then the observed primordial baryon asymmetry may also be achieved in this scenario through spontaneous baryogenesis. We present explicit orbifold constructions where the dark gauge groups unify with the SM at the GUT scale and axions emerge as the fifth components of dark gauge fields with bulk Chern-Simons terms.

Authors:
 [1]; ORCiD logo [2];  [2];  [3]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  2. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  3. Technion-Israel Institute of Technology, Haifa (Israel)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
2246877
Grant/Contract Number:  
AC02-05CH11231; SC0019225
Resource Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2022; Journal Issue: 12; Journal ID: ISSN 1029-8479
Publisher:
Springer Nature
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Foster, Joshua W., Kumar, Soubhik, Safdi, Benjamin R., and Soreq, Yotam. Dark Grand Unification in the axiverse: decaying axion dark matter and spontaneous baryogenesis. United States: N. p., 2022. Web. doi:10.1007/jhep12(2022)119.
Foster, Joshua W., Kumar, Soubhik, Safdi, Benjamin R., & Soreq, Yotam. Dark Grand Unification in the axiverse: decaying axion dark matter and spontaneous baryogenesis. United States. https://doi.org/10.1007/jhep12(2022)119
Foster, Joshua W., Kumar, Soubhik, Safdi, Benjamin R., and Soreq, Yotam. Tue . "Dark Grand Unification in the axiverse: decaying axion dark matter and spontaneous baryogenesis". United States. https://doi.org/10.1007/jhep12(2022)119. https://www.osti.gov/servlets/purl/2246877.
@article{osti_2246877,
title = {Dark Grand Unification in the axiverse: decaying axion dark matter and spontaneous baryogenesis},
author = {Foster, Joshua W. and Kumar, Soubhik and Safdi, Benjamin R. and Soreq, Yotam},
abstractNote = {The quantum chromodynamics axion with a decay constant near the Grand Unification (GUT) scale has an ultralight mass near a neV. We show, however, that axion-like particles with masses near the keV–PeV range with GUT-scale decay constants are also well motivated in that they naturally arise from axiverse theories with dark c gauge groups. We demonstrate that the correct dark matter abundance may be achieved by the heavy axions in these models through the misalignment mechanism in combination with a period of early matter domination from the long-lived dark glueballs of the same gauge group. Heavy axion dark matter may decay to two photons, yielding mono-energetic electromagnetic signatures that may be detectable by current or next-generation space-based telescopes. We project the sensitivity of next-generation telescopes including Athena, AMEGO, and e-ASTROGAM to such decaying axion dark matter. If the dark sector contains multiple confining gauge groups, then the observed primordial baryon asymmetry may also be achieved in this scenario through spontaneous baryogenesis. We present explicit orbifold constructions where the dark gauge groups unify with the SM at the GUT scale and axions emerge as the fifth components of dark gauge fields with bulk Chern-Simons terms.},
doi = {10.1007/jhep12(2022)119},
journal = {Journal of High Energy Physics (Online)},
number = 12,
volume = 2022,
place = {United States},
year = {Tue Dec 20 00:00:00 EST 2022},
month = {Tue Dec 20 00:00:00 EST 2022}
}

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