Unbound particles in dark matter halos

Peter S. Behroozi, Abraham Loeb, Risa H. Wechsler

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

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.

Original languageEnglish (US)
Article number019
JournalJournal of Cosmology and Astroparticle Physics
Volume2013
Issue number6
DOIs
StatePublished - Jun 2013
Externally publishedYes

Keywords

  • Cosmological parameters from LSS
  • Cosmological simulations
  • Galaxy clusters
  • Supernovas

ASJC Scopus subject areas

  • Astronomy and Astrophysics

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