Abstract

Using a recently proposed gauge invariant formulation of light-cone averaging, together with adapted "geodesic light-cone" coordinates, we show how an "induced backreaction" effect emerges, in general, from correlated fluctuations in the luminosity distance and co-variant integration measure. Considering a realistic stochastic spectrum of inhomogeneities of primordial (inflationary) origin we find that both the induced backreaction on the luminosity-redshift relation and the dispersion are larger than naively expected. On the other hand the former, at least to leading order and in the linear perturbative regime, cannot account by itself for the observed effects of dark energy at large-redshifts. A full second-order calculation, or even better a reliable estimate of contributions from the non-linear regime, appears to be necessary before firm conclusions on the correct interpretation of the data can be drawn.

Autore Pugliese

• Gasperini Maurizio

Tutti gli autori

• GASPERINI M.

Titolo volume/Rivista

Non Disponibile

Anno di pubblicazione

2012

ISSN

1475-7516

ISBN

Non Disponibile

Numero di citazioni Wos

37

Ultimo Aggiornamento Citazioni

Non Disponibile

Numero di citazioni Scopus

47

Ultimo Aggiornamento Citazioni

Non Disponibile

Settori ERC

Non Disponibile

Codici ASJC

Non Disponibile