Unitarity limits on the mass and radius of dark-matter particles

Kim Griest and Marc Kamionkowski
Phys. Rev. Lett. 64, 615 – Published 5 February 1990
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Abstract

Using partial-wave unitarity and the observed density of the Universe, we show that a stable elementary particle which was once in thermal equilibrium cannot have a mass greater than 340 TeV. An extended object which was once in thermal equilibrium cannot have a radius less than 7.5×107 fm. A lower limit to the relic abundance of such particles is also found.

  • Received 5 October 1989

DOI:https://doi.org/10.1103/PhysRevLett.64.615

©1990 American Physical Society

Authors & Affiliations

Kim Griest

  • Center for Particle Astrophysics, University of California, Berkeley, California 94720

Marc Kamionkowski

  • Physics Department, Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637-1433
  • NASA/Fermilab Astrophysics Center, Fermi National Accelerator Laboratory, Batavia, Illinois 60510-0500

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Vol. 64, Iss. 6 — 5 February 1990

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