Do Stochastic Inhomogeneities Affect Dark-Energy Precision Measurements?

I. Ben-Dayan, M. Gasperini, G. Marozzi, F. Nugier, and G. Veneziano
Phys. Rev. Lett. 110, 021301 – Published 7 January 2013

Abstract

The effect of a stochastic background of cosmological perturbations on the luminosity-redshift relation is computed to second order through a recently proposed covariant and gauge-invariant light-cone averaging procedure. The resulting expressions are free from both ultraviolet and infrared divergences, implying that such perturbations cannot mimic a sizable fraction of dark energy. Different averages are estimated and depend on the particular function of the luminosity distance being averaged. The energy flux being minimally affected by perturbations at large z is proposed as the best choice for precision estimates of dark-energy parameters. Nonetheless, its irreducible (stochastic) variance induces statistical errors on ΩΛ(z) typically lying in the few-percent range.

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  • Received 6 July 2012

DOI:https://doi.org/10.1103/PhysRevLett.110.021301

© 2013 American Physical Society

Authors & Affiliations

I. Ben-Dayan1,2, M. Gasperini3,4, G. Marozzi5, F. Nugier6, and G. Veneziano5,7

  • 1Canadian Institute for Theoretical Astrophysics, 60 St. George Street, Toronto, Ontario M5S 3H8, Canada
  • 2Perimeter Institute for Theoretical Physics, Waterloo, Ontario N2L 2Y5, Canada
  • 3Dipartimento di Fisica, Università di Bari, Via G. Amendola 173, 70126 Bari, Italy
  • 4Istituto Nazionale di Fisica Nucleare, Sezione di Bari, Via G. Amendola 173, 70126 Bari, Italy
  • 5Collège de France, 11 Place M. Berthelot, 75005 Paris, France
  • 6Laboratoire de Physique Théorique de l’École Normale Supérieure, CNRS UMR 8549, 24 Rue Lhomond, 75005 Paris, France
  • 7CERN, Theory Unit, Physics Department, CH-1211 Geneva 23, Switzerland

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Issue

Vol. 110, Iss. 2 — 11 January 2013

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