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Title: Large N-ightmare dark matter

Abstract

A dark QCD sector is a relatively minimal extension of the Standard Model (SM) that admits Dark Matter (DM) candidates, but requires no portal to the visible sector beyond gravitational interactions: a "nightmare scenario" for DM detection. Here, we consider a secluded dark sector containing a single flavor of light, vector-like dark quark gauged under (N). In the large-N limit, this single-flavor theory becomes highly predictive, generating two DM candidates whose masses and dynamics are described by few parameters: a light quark-antiquark bound state, the dark analog of the η' meson, and a heavy bound state of N quarks, the dark analog of the Δ++ baryon. We show that the latter may freeze-in with an abundance independent of the confinement scale, forming DM-like relics for N ≲ 10, while the former may generate DM via cannibalization and freeze-out. We study the interplay of this two-component DM system, and determine the characteristic ranges of the confinement scale, dark-visible sector temperature ratio, and N that admit non-excluded DM, once effects of self-interaction constraints and bounds on effective degrees of freedom at the BBN and CMB epochs are included.

Authors:
 [1];  [1];  [2]
+ Show Author Affiliations
  1. Univ. of California, Santa Cruz, CA (United States)
  2. Univ. of California, Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1836491
Grant/Contract Number:  
AC02-05CH11231; SC0010107
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2021; Journal Issue: 05; Journal ID: ISSN 1475-7516
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; cosmology of theories beyond the SM; dark matter theory; particle physics - cosmology connection

Citation Formats

Morrison, Logan, Profumo, Stefano, and Robinson, Dean J. Large N-ightmare dark matter. United States: N. p., 2021. Web. doi:10.1088/1475-7516/2021/05/058.
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Morrison, Logan, Profumo, Stefano, & Robinson, Dean J. Large N-ightmare dark matter. United States. https://doi.org/10.1088/1475-7516/2021/05/058
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Morrison, Logan, Profumo, Stefano, and Robinson, Dean J. Thu . "Large N-ightmare dark matter". United States. https://doi.org/10.1088/1475-7516/2021/05/058. https://www.osti.gov/servlets/purl/1836491.
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@article{osti_1836491,
title = {Large N-ightmare dark matter},
author = {Morrison, Logan and Profumo, Stefano and Robinson, Dean J.},
abstractNote = {A dark QCD sector is a relatively minimal extension of the Standard Model (SM) that admits Dark Matter (DM) candidates, but requires no portal to the visible sector beyond gravitational interactions: a "nightmare scenario" for DM detection. Here, we consider a secluded dark sector containing a single flavor of light, vector-like dark quark gauged under (N). In the large-N limit, this single-flavor theory becomes highly predictive, generating two DM candidates whose masses and dynamics are described by few parameters: a light quark-antiquark bound state, the dark analog of the η' meson, and a heavy bound state of N quarks, the dark analog of the Δ++ baryon. We show that the latter may freeze-in with an abundance independent of the confinement scale, forming DM-like relics for N ≲ 10, while the former may generate DM via cannibalization and freeze-out. We study the interplay of this two-component DM system, and determine the characteristic ranges of the confinement scale, dark-visible sector temperature ratio, and N that admit non-excluded DM, once effects of self-interaction constraints and bounds on effective degrees of freedom at the BBN and CMB epochs are included.},
doi = {10.1088/1475-7516/2021/05/058},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 05,
volume = 2021,
place = {United States},
year = {Thu May 20 00:00:00 EDT 2021},
month = {Thu May 20 00:00:00 EDT 2021}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1088/1475-7516/2021/05/058
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