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Dark degeneracy and interacting cosmic components

Alejandro Aviles1,* and Jorge L. Cervantes-Cota2,†

  • 1Instituto de Ciencias Nucleares, UNAM, México
  • 2Depto. de Física, Instituto Nacional de Investigaciones Nucleares, México

  • *aviles@ciencias.unam.mx
  • †jorge.cervantes@inin.gob.mx
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Phys. Rev. D 84, 083515 – Published 13 October, 2011Erratum Phys. Rev. D 84, 089905 (2011)

DOI: https://doi.org/10.1103/PhysRevD.84.083515

Abstract

We study some properties of the dark degeneracy, which is the fact that what we measure in gravitational experiments is the energy-momentum tensor of the total dark sector, and any split into components (as in dark matter and dark energy) is arbitrary. In fact, just one dark fluid is necessary to obtain exactly the same cosmological and astrophysical phenomenology as the ΛCDM model. We work explicitly the first-order perturbation theory and show that beyond the linear order the dark degeneracy is preserved under some general assumptions. Then we construct the dark fluid from a collection of interacting fluids. Finally, we try to break the degeneracy with a general class of couplings to baryonic matter. Nonetheless, we show that these interactions can also be understood in the context of the ΛCDM model as between dark matter and baryons. For this last investigation we choose two independent parametrizations for the interactions, one inspired by electromagnetism and the other by chameleon theories. Then, we constrain them with a joint analysis of CMB and supernovae observational data.

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Corrections

18 October, 2011

Erratum

Publisher’s Note: Dark degeneracy and interacting cosmic components [Phys. Rev. DPRVDAQ1550-7998 84, 083515 (2011)10.1103/PhysRevD.84.083515]

Alejandro Aviles and Jorge L. Cervantes-Cota
Phys. Rev. D 84, 089905 (2011)

Article Text

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Outline

Information

Phys. Rev. D 84, 083515– Published 13 October, 2011
  • Received 15 August 2011
  • Publisher error corrected 18 October 2011

© 2011 American Physical Society

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