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Cosmology of mass-varying neutrinos driven by quintessence: Theory and observations

A. W. Brookfield1, C. van de Bruck2, D. F. Mota3, and D. Tocchini-Valentini4

  • 1Department of Applied Mathematics and Department of Physics, Astro-Particle Theory Cosmology Group, Hounsfield Road, Hicks Building, University of Sheffield, Sheffield S3 7RH, United Kingdom
  • 2Department of Applied Mathematics, Astro-Particle Theory Cosmology Group, Hounsfield Road, Hicks Building, University of Sheffield, Sheffield S3 7RH, United Kingdom
  • 3Institute of Theoretical Astrophysics, University of Oslo, 0315 Oslo, Norway
  • 4Astrophysics Department, Oxford University, Keble Road, Oxford OX1 3RH, United Kingdom and Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218, USA

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Phys. Rev. D 73, 083515 – Published 12 April, 2006Erratum Phys. Rev. D 76, 049901 (2007)

DOI: https://doi.org/10.1103/PhysRevD.73.083515

Abstract

The effects of mass-varying neutrinos on cosmic microwave background (CMB) anisotropies and large scale structures (LSS) are studied. In these models, dark energy and neutrinos are coupled such that the neutrino masses are functions of the scalar field playing the role of dark energy. We begin by describing the cosmological background evolution of such a system. It is pointed out that, similar to models with a dark matter/dark energy interaction, the apparent equation of state measured with SNIa can be smaller than −1. We then discuss the effect of mass-varying neutrinos on the CMB anisotropies and the matter power spectrum. A suppression of power in the CMB power spectrum at large angular scales is usually observed. We give an explanation for this behavior and discuss different couplings and quintessence potentials to show the generality of the results obtained. We perform a likelihood analysis using wide-ranging SNIa, CMB, and LSS observations to assess whether such theories are viable. Treating the neutrino mass as a free parameter we find that the constraints on the coupling are weak, since CMB and LSS surveys give only upper bounds on the neutrino mass. However, fixing a priori the neutrino masses, we find that there is some evidence that the existence of such a coupling is actually preferred by current cosmological data over the standard ΛCDM cosmology.

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Erratum

Erratum: Cosmology of mass-varying neutrinos driven by quintessence: Theory and observations [Phys. Rev. D 73, 083515 (2006)]

A. W. Brookfield, C. van de Bruck, D. F. Mota, and D. Tocchini-Valentini
Phys. Rev. D 76, 049901 (2007)

Article Text

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Phys. Rev. D 73, 083515– Published 12 April, 2006
  • Received 10 January 2006

© 2006 American Physical Society

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