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

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:
 [1] ;  [2] ;  [3] ;  [3]
  1. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Hebrew Univ. of Jerusalem, Jerusalem (Israel)
  3. Syracuse Univ., Syracuse, NY (United States)
Publication Date:
Grant/Contract Number:
AC02-05CH11231; FG02-85ER40237
Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 97; Journal Issue: 6; Related Information: © 2018 authors. Published by the American Physical Society.; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS
OSTI Identifier:
1427881
Alternate Identifier(s):
OSTI ID: 1465446

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., 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. 2018. "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}
}