Phys. Rev. D 64, 021302(R) (2001) - Kinetic decoupling of neutralino dark matter

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Kinetic decoupling of neutralino dark matter

Xuelei Chen, Marc Kamionkowski, and Xinmin Zhang

Phys. Rev. D 64, 021302(R) – Published 25 June 2001

Abstract

After neutralinos cease annihilating in the early Universe, they may still scatter elastically from other particles in the primordial plasma. At some point in time, however, they will eventually stop scattering. We calculate the cross sections for neutralino elastic scattering from standard-model particles to determine the time at which this kinetic decoupling occurs. We show that kinetic decoupling occurs above a temperature $T \sim MeV .$ Thereafter, neutralinos act as collisionless cold dark matter.

Received 27 March 2001

DOI:https://doi.org/10.1103/PhysRevD.64.021302

©2001 American Physical Society

Authors & Affiliations

Department of Physics, The Ohio State University, 174 West 18th Avenue, Columbus, Ohio 43210

Marc Kamionkowski^†

California Institute of Technology, Mail Code 130-33, Pasadena, California 91225

Xinmin Zhang^‡

Institute of High Energy Physics, Chinese Academy of Sciences, P.O. Box 918-4, Beijing 100039, People’s Republic of China

^*Electronic address: xuelei@pacific.mps.ohio-state.edu
^†Electronic address: kamion@tapir.caltech.edu
^‡Electronic address: xmzhang@alpha02.ihep.ac.cn

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Vol. 64, Iss. 2 — 15 July 2001

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