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Title: Boosted dark matter signals uplifted with self-interaction

We explore detection prospects of a non-standard dark sector in the context of boosted dark matter. We focus on a scenario with two dark matter particles of a large mass difference, where the heavier candidate is secluded and interacts with the standard model particles only at loops, escaping existing direct and indirect detection bounds. Yet its pair annihilation in the galactic center or in the Sun may produce boosted stable particles, which could be detected as visible Cherenkov light in large volume neutrino detectors. In such models with multiple candidates, self-interaction of dark matter particles is naturally utilized in the assisted freeze-out mechanism and is corroborated by various cosmological studies such as N-body simulations of structure formation, observations of dwarf galaxies, and the small scale problem. We show that self-interaction of the secluded (heavier) dark matter greatly enhances the capture rate in the Sun and results in promising signals at current and future experiments. We perform a detailed analysis of the boosted dark matter events for Super-Kamiokande, Hyper-Kamiokande and PINGU, including notable effects such as evaporation due to self-interaction and energy loss in the Sun.
Authors:
 [1] ; ORCiD logo [1] ;  [2]
  1. Univ. of Kansas, Lawrence, KS (United States)
  2. Univ. of Kansas, Lawrence, KS (United States); Sungkyunkwan Univ., Suwon (Republic of Korea)
Publication Date:
Grant/Contract Number:
FG02-12ER41809; 2301566; NRF-2013R1A1A2061561; 88614
Type:
Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 743; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Research Org:
Univ. of Kansas, Lawrence, KS (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; boosted dark matter; assisted freeze-out; self-interacting dark matter; dark matter capture; sun; super-K
OSTI Identifier:
1228401
Alternate Identifier(s):
OSTI ID: 1188773