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Generation of curvature perturbations with extra anisotropic stress

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Published 15 February 2010 • Published under licence by IOP Publishing Ltd
, , Citation Kazuhiko Kojima et al JCAP02(2010)018 DOI 10.1088/1475-7516/2010/02/018

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Author affiliations

1 Department of Astronomy, Graduate school of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

2 Division of Theoretical Astrophysics, National Astronomical Observatory, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan

3 Center for Astrophysics, Department of Physics, University of Notre Dame, Notre Dame, IN 46556, U.S.A.

Dates

  1. Received 16 October 2009
  2. Accepted 28 January 2010
  3. Published

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1475-7516/2010/02/018

Abstract

We study the evolution of curvature perturbations and the cosmic microwave background (CMB) power spectrum in the presence of an hypothesized extra anisotropic stress which might arise, for example, from the dark radiation term in brane-world cosmology. We evolve the scalar modes of such perturbations before and after neutrino decoupling and analyze their effects on the CMB spectrum. A novel result of this work is that the cancellation of the neutrino and extra anisotropic stress could lead to a spectrum of residual curvature perturbations which is similar to the observed CMB power spectrum. This implies a possible additional consideration in the determination of cosmological parameters from the CMB analysis.

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10.1088/1475-7516/2010/02/018