Dark matter self-interactions from higher dimensional gravity

Nicolas Chatillon, Cosmin Macesanu, Aleksandr Pinzul, and Mark Trodden
Phys. Rev. D 73, 123516 – Published 12 June 2006

Abstract

It has recently been suggested that, in a brane-world scenario with large extra dimensions, short-distance gravitational interactions can enhance the dark matter scattering cross section in a velocity-dependent way. Such a modification may then help to address possible problems with noninteracting cold dark matter on galactic and subgalactic scales. We argue that, considering the singular character of the higher-dimensional Newtonian potential, the scattering cross section is UV dependent, depending ultimately on the underlying quantum gravity theory considered. We demonstrate that, for a wide class of unitary short-distance regularizations, the actual cross section is velocity independent and does not significantly affect the dark matter substructure. We comment on the problem of thermalization of ultralight cold dark matter by gravitational interactions in the early universe.

  • Received 30 January 2006

DOI:https://doi.org/10.1103/PhysRevD.73.123516

©2006 American Physical Society

Authors & Affiliations

Nicolas Chatillon*, Cosmin Macesanu, Aleksandr Pinzul, and Mark Trodden§

  • Department of Physics, Syracuse University, Syracuse, New York 13244-1130, USA

  • *Electronic address: nchatill@physics.syr.edu
  • Electronic address: cmacesan@physics.syr.edu
  • Electronic address: apinzul@physics.syr.edu
  • §Electronic address: trodden@physics.syr.edu

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Issue

Vol. 73, Iss. 12 — 15 June 2006

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