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Title:
Can Cosmic Structure Form without Dark Matter?
Authors:
Dodelson, Scott; Liguori, Michele
Affiliation:
AA(Particle Astrophysics Center, Fermi National Accelerator Laboratory, Batavia, Illinois 60510-0500, USA; Department of Astronomy & Astrophysics, The University of Chicago, Chicago, Illinois 60637-1433, USA), AB(Particle Astrophysics Center, Fermi National Accelerator Laboratory, Batavia, Illinois 60510-0500, USA; Dipartimento di Fisica “G. Galilei” Università di Padova, INFN sezione di Padova, Via Marzolo 8, I-35131 Padova, Italy)
Publication:
Physical Review Letters, vol. 97, Issue 23, id. 231301 (PhRvL Homepage)
Publication Date:
12/2006
Origin:
APS
PACS Keywords:
Particle-theory and field-theory models of the early Universe, Gravity in more than four dimensions, Kaluza-Klein theory, unified field theories; alternative theories of gravity, Superclusters; large-scale structure of the Universe, Mathematical and relativistic aspects of cosmology
DOI:
10.1103/PhysRevLett.97.231301
Bibliographic Code:
2006PhRvL..97w1301D

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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