Can Cosmic Structure form without Dark Matter?

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One of the prime pieces of evidence for dark matter is the observation of large overdense regions in the universe. Since we know from the cosmic microwave background that the regions that contained the most baryons when the universe was {approx} 400, 000 years old were overdense by only one part in ten thousand, perturbations had to have grown since then by a factor greater than (1 + z{sub *}) {approx_equal} 1180 where z{sub *} is the epoch of recombination. This enhanced growth does not happen in general relativity, so dark matter is needed in the standard theory. We show ... continued below

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5 pages

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Dodelson, Scott; /Fermilab /Chicago U., Astron. Astrophys. Ctr.; Liguori, Michele & /Fermilab /Padua U. /INFN, Padua August 1, 2006.

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One of the prime pieces of evidence for dark matter is the observation of large overdense regions in the universe. Since we know from the cosmic microwave background that the regions that contained the most baryons when the universe was {approx} 400, 000 years old were overdense by only one part in ten thousand, perturbations had to have grown since then by a factor greater than (1 + z{sub *}) {approx_equal} 1180 where z{sub *} is the epoch of recombination. This enhanced growth does not happen in general relativity, 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 (MOND). The vector field introduced in that theory for a completely different reason plays a key role in generating the instability that produces large cosmic structures today.

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5 pages

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  • Journal Name: Phys.Rev.Lett.97:231301,2006

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  • Report No.: FERMILAB-PUB-06-312-A
  • Grant Number: AC02-07CH11359
  • DOI: 10.1103/PhysRevLett.97.231301 | External Link
  • Office of Scientific & Technical Information Report Number: 897601
  • Archival Resource Key: ark:/67531/metadc884570

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  • August 1, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • Nov. 22, 2016, 9:53 p.m.

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Dodelson, Scott; /Fermilab /Chicago U., Astron. Astrophys. Ctr.; Liguori, Michele & /Fermilab /Padua U. /INFN, Padua. Can Cosmic Structure form without Dark Matter?, article, August 1, 2006; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc884570/: accessed September 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.