The end of unified dark matter?

Håvard B. Sandvik, Max Tegmark, Matias Zaldarriaga, and Ioav Waga
Phys. Rev. D 69, 123524 – Published 30 June 2004
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Abstract

Despite the interest in dark matter and dark energy, it has never been shown that they are in fact two separate substances. We provide the first strong evidence that they are separate by ruling out a broad class of so-called unified dark matter models that have attracted much recent interest. We find that they produce oscillations or exponential blowup of the dark matter power spectrum inconsistent with observation. For the particular case of generalized Chaplygin gas models, 99.999% of the previously allowed parameter space is excluded, leaving essentially only the standard ΛCDM limit allowed.

  • Received 9 December 2002

DOI:https://doi.org/10.1103/PhysRevD.69.123524

©2004 American Physical Society

Authors & Affiliations

Håvard B. Sandvik1,*, Max Tegmark1, Matias Zaldarriaga2, and Ioav Waga3

  • 1Department of Physics, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
  • 2Department of Physics, New York University, 4 Washington Pl., New York, New York 10003, USA
  • 3Universidade Federal do Rio de Janeiro, Instituto de Física, Cep 21041-972, Brazil

  • *Email address: sandvik@hep.upenn.edu

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Vol. 69, Iss. 12 — 15 June 2004

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