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Title: MeV Dark Matter and Small Scale Structure

Abstract

WIMPs with electroweak scale masses (neutralinos, etc.) remain in kinetic equilibrium with other particle species until temperatures approximately in the range of 10 MeV to 1 GeV, leading to the formation of dark matter substructure with masses as small as 10{sup -4} M{sub {circle_dot}} to 10{sup -12} M{sub {circle_dot}}. However, if dark matter consists of particles with MeV scale masses, as motivated by the observation of 511 keV emission from the Galactic Bulge, such particles are naturally expected to remain in kinetic equilibrium with the cosmic neutrino background until considerably later times. This would lead to a strong suppression of small scale structure with masses below about 10{sup 7}M{sub {circle_dot}} to 10{sup 4} M{sub {circle_dot}}. This cutoff scale has important implications for present and future searches for faint Local Group satellite galaxies and for the missing satellites problem.

Authors:
; ; ;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
902874
Report Number(s):
FERMILAB-PUB-07-064-A
arXiv eprint number arXiv:0704.2558; TRN: US0703009
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COSMIC NEUTRINOS; GALAXIES; KINETICS; NONLUMINOUS MATTER; SATELLITES; Astrophysics

Citation Formats

Hooper, Dan, /Fermilab, Kaplinghat, Manoj, Strigari, Louis E, /UC, Irvine, Zurek, Kathryn M, and /Wisconsin U., Madison. MeV Dark Matter and Small Scale Structure. United States: N. p., 2007. Web. doi:10.1103/PhysRevD.76.103515.
Hooper, Dan, /Fermilab, Kaplinghat, Manoj, Strigari, Louis E, /UC, Irvine, Zurek, Kathryn M, & /Wisconsin U., Madison. MeV Dark Matter and Small Scale Structure. United States. https://doi.org/10.1103/PhysRevD.76.103515
Hooper, Dan, /Fermilab, Kaplinghat, Manoj, Strigari, Louis E, /UC, Irvine, Zurek, Kathryn M, and /Wisconsin U., Madison. 2007. "MeV Dark Matter and Small Scale Structure". United States. https://doi.org/10.1103/PhysRevD.76.103515. https://www.osti.gov/servlets/purl/902874.
@article{osti_902874,
title = {MeV Dark Matter and Small Scale Structure},
author = {Hooper, Dan and /Fermilab and Kaplinghat, Manoj and Strigari, Louis E and /UC, Irvine and Zurek, Kathryn M and /Wisconsin U., Madison},
abstractNote = {WIMPs with electroweak scale masses (neutralinos, etc.) remain in kinetic equilibrium with other particle species until temperatures approximately in the range of 10 MeV to 1 GeV, leading to the formation of dark matter substructure with masses as small as 10{sup -4} M{sub {circle_dot}} to 10{sup -12} M{sub {circle_dot}}. However, if dark matter consists of particles with MeV scale masses, as motivated by the observation of 511 keV emission from the Galactic Bulge, such particles are naturally expected to remain in kinetic equilibrium with the cosmic neutrino background until considerably later times. This would lead to a strong suppression of small scale structure with masses below about 10{sup 7}M{sub {circle_dot}} to 10{sup 4} M{sub {circle_dot}}. This cutoff scale has important implications for present and future searches for faint Local Group satellite galaxies and for the missing satellites problem.},
doi = {10.1103/PhysRevD.76.103515},
url = {https://www.osti.gov/biblio/902874}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Apr 01 00:00:00 EDT 2007},
month = {Sun Apr 01 00:00:00 EDT 2007}
}