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 $\Omega_{\Lambda}(z)$ typically lying in the few-percent range.

Autore Pugliese

• Gasperini Maurizio

Tutti gli autori

• GASPERINI M.

Titolo volume/Rivista

Non Disponibile

Anno di pubblicazione

2013

ISSN

0031-9007

ISBN

Non Disponibile

Numero di citazioni Wos

52

Ultimo Aggiornamento Citazioni

Non Disponibile

Numero di citazioni Scopus

61

Ultimo Aggiornamento Citazioni

Non Disponibile

Settori ERC

Non Disponibile

Codici ASJC

Non Disponibile