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Title: Exponentially light dark matter from coannihilation

Abstract

Dark matter may be a thermal relic whose abundance is set by mutual annihilations among multiple species. Traditionally, this coannihilation scenario has been applied to weak scale dark matter that is highly degenerate with other states. Here, we show that coannihilation among states with split masses points to dark matter that is exponentially lighter than the weak scale, down to the keV scale. We highlight the regime where dark matter does not participate in the annihilations that dilute its number density. In this “sterile coannihilation” limit, the dark matter relic density is independent of its couplings, implying a broad parameter space of thermal relic targets for future experiments. Light dark matter from coannihilation evades stringent bounds from the cosmic microwave background, but will be tested by future direct detection, fixed target, and long-lived particle experiments.

Authors:
 [1];  [2];  [3];  [2]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  2. New York Univ. (NYU), NY (United States). Center for Cosmology and Particle Physics, Dept. of Physics
  3. European Organization for Nuclear Research (CERN), Geneva (Switzerland). Theoretical Physics Dept.
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1475544
Grant/Contract Number:  
AC02-76SF00515
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: 2018; Journal Issue: 8; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 79 ASTRONOMY AND ASTROPHYSICS; Beyond Standard Model; Cosmology of Theories beyond the SM

Citation Formats

D’Agnolo, Raffaele Tito, Mondino, Cristina, Ruderman, Joshua T., and Wang, Po-Jen. Exponentially light dark matter from coannihilation. United States: N. p., 2018. Web. doi:10.1007/jhep08(2018)079.
D’Agnolo, Raffaele Tito, Mondino, Cristina, Ruderman, Joshua T., & Wang, Po-Jen. Exponentially light dark matter from coannihilation. United States. doi:10.1007/jhep08(2018)079.
D’Agnolo, Raffaele Tito, Mondino, Cristina, Ruderman, Joshua T., and Wang, Po-Jen. Tue . "Exponentially light dark matter from coannihilation". United States. doi:10.1007/jhep08(2018)079. https://www.osti.gov/servlets/purl/1475544.
@article{osti_1475544,
title = {Exponentially light dark matter from coannihilation},
author = {D’Agnolo, Raffaele Tito and Mondino, Cristina and Ruderman, Joshua T. and Wang, Po-Jen},
abstractNote = {Dark matter may be a thermal relic whose abundance is set by mutual annihilations among multiple species. Traditionally, this coannihilation scenario has been applied to weak scale dark matter that is highly degenerate with other states. Here, we show that coannihilation among states with split masses points to dark matter that is exponentially lighter than the weak scale, down to the keV scale. We highlight the regime where dark matter does not participate in the annihilations that dilute its number density. In this “sterile coannihilation” limit, the dark matter relic density is independent of its couplings, implying a broad parameter space of thermal relic targets for future experiments. Light dark matter from coannihilation evades stringent bounds from the cosmic microwave background, but will be tested by future direct detection, fixed target, and long-lived particle experiments.},
doi = {10.1007/jhep08(2018)079},
journal = {Journal of High Energy Physics (Online)},
number = 8,
volume = 2018,
place = {United States},
year = {2018},
month = {8}
}

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Cited by: 7 works
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