Can Cosmic Structure Form without Dark Matter?

Scott Dodelson and Michele Liguori
Phys. Rev. Lett. 97, 231301 – Published 7 December 2006

Abstract

One of the prime pieces of evidence for dark matter is the observation of large overdense regions in the Universe. To account for this observation, perturbations had to have grown since recombination by a factor greater than (1+z*)1180 where z* is the epoch of recombination. This enhanced growth does not happen in general relativity, and so dark matter is needed in the standard theory. We show here that enhanced growth can occur in alternatives to general relativity, in particular, in Bekenstein’s relativistic version of modified Newtonian dynamics.

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  • Received 5 September 2006

DOI:https://doi.org/10.1103/PhysRevLett.97.231301

©2006 American Physical Society

Authors & Affiliations

Scott Dodelson1,2 and Michele Liguori1,3

  • 1Particle Astrophysics Center, Fermi National Accelerator Laboratory, Batavia, Illinois 60510-0500, USA
  • 2Department of Astronomy & Astrophysics, The University of Chicago, Chicago, Illinois 60637-1433, USA
  • 3Dipartimento di Fisica “G. Galilei” Università di Padova, INFN sezione di Padova, Via Marzolo 8, I-35131 Padova, Italy

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Vol. 97, Iss. 23 — 8 December 2006

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