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Title: Concentrated dark matter: Enhanced small-scale structure from codecaying dark matter

Abstract

We study the cosmological consequences of codecaying dark matter - a recently proposed mechanism for depleting the density of dark matter through the decay of nearly degenerate particles. A generic prediction of this framework is an early dark matter dominated phase in the history of the Universe, that results in the enhanced growth of dark matter perturbations on small scales. We compute the duration of the early matter dominated phase and show that the perturbations are robust against washout from free streaming. The enhanced small-scale structure is expected to survive today in the form of compact microhalos and can lead to significant boost factors for indirect-detection experiments, such as FERMI, where dark matter would appear as point sources.

Authors:
; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1427881
Alternate Identifier(s):
OSTI ID: 1465446
Grant/Contract Number:  
FG02-85ER40237; AC02-05CH11231
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Name: Physical Review D Journal Volume: 97 Journal Issue: 6; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Dror, Jeff A., Kuflik, Eric, Melcher, Brandon, and Watson, Scott. Concentrated dark matter: Enhanced small-scale structure from codecaying dark matter. United States: N. p., 2018. Web. doi:10.1103/PhysRevD.97.063524.
Dror, Jeff A., Kuflik, Eric, Melcher, Brandon, & Watson, Scott. Concentrated dark matter: Enhanced small-scale structure from codecaying dark matter. United States. doi:10.1103/PhysRevD.97.063524.
Dror, Jeff A., Kuflik, Eric, Melcher, Brandon, and Watson, Scott. Thu . "Concentrated dark matter: Enhanced small-scale structure from codecaying dark matter". United States. doi:10.1103/PhysRevD.97.063524.
@article{osti_1427881,
title = {Concentrated dark matter: Enhanced small-scale structure from codecaying dark matter},
author = {Dror, Jeff A. and Kuflik, Eric and Melcher, Brandon and Watson, Scott},
abstractNote = {We study the cosmological consequences of codecaying dark matter - a recently proposed mechanism for depleting the density of dark matter through the decay of nearly degenerate particles. A generic prediction of this framework is an early dark matter dominated phase in the history of the Universe, that results in the enhanced growth of dark matter perturbations on small scales. We compute the duration of the early matter dominated phase and show that the perturbations are robust against washout from free streaming. The enhanced small-scale structure is expected to survive today in the form of compact microhalos and can lead to significant boost factors for indirect-detection experiments, such as FERMI, where dark matter would appear as point sources.},
doi = {10.1103/PhysRevD.97.063524},
journal = {Physical Review D},
number = 6,
volume = 97,
place = {United States},
year = {2018},
month = {3}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevD.97.063524

Citation Metrics:
Cited by: 5 works
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