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Title: Unbound particles in dark matter halos

Abstract

We investigate unbound dark matter particles in halos by tracing particle trajectories in a simulation run to the far future (a = 100). We find that the traditional sum of kinetic and potential energies is a very poor predictor of which dark matter particles will eventually become unbound from halos. We also study the mass fraction of unbound particles, which increases strongly towards the edges of halos, and decreases significantly at higher redshifts. We discuss implications for dark matter detection experiments, precision calibrations of the halo mass function, the use of baryon fractions to constrain dark energy, and searches for intergalactic supernovae.

Authors:
; ;
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1076824
Report Number(s):
SLAC-PUB-15442
Journal ID: ISSN 1475-7516; arXiv:1208.0334
DOE Contract Number:  
AC02-76SF00515
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2013; Journal Issue: 06; Journal ID: ISSN 1475-7516
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Astrophysics; ASTRO

Citation Formats

Behroozi, Peter S., Loeb, Abraham, and Wechsler, Risa H. Unbound particles in dark matter halos. United States: N. p., 2013. Web. doi:10.1088/1475-7516/2013/06/019.
Behroozi, Peter S., Loeb, Abraham, & Wechsler, Risa H. Unbound particles in dark matter halos. United States. https://doi.org/10.1088/1475-7516/2013/06/019
Behroozi, Peter S., Loeb, Abraham, and Wechsler, Risa H. 2013. "Unbound particles in dark matter halos". United States. https://doi.org/10.1088/1475-7516/2013/06/019. https://www.osti.gov/servlets/purl/1076824.
@article{osti_1076824,
title = {Unbound particles in dark matter halos},
author = {Behroozi, Peter S. and Loeb, Abraham and Wechsler, Risa H.},
abstractNote = {We investigate unbound dark matter particles in halos by tracing particle trajectories in a simulation run to the far future (a = 100). We find that the traditional sum of kinetic and potential energies is a very poor predictor of which dark matter particles will eventually become unbound from halos. We also study the mass fraction of unbound particles, which increases strongly towards the edges of halos, and decreases significantly at higher redshifts. We discuss implications for dark matter detection experiments, precision calibrations of the halo mass function, the use of baryon fractions to constrain dark energy, and searches for intergalactic supernovae.},
doi = {10.1088/1475-7516/2013/06/019},
url = {https://www.osti.gov/biblio/1076824}, journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 06,
volume = 2013,
place = {United States},
year = {Thu Jun 13 00:00:00 EDT 2013},
month = {Thu Jun 13 00:00:00 EDT 2013}
}