The luminosity distance-redshift relation is one of the fundamental tools of modern cosmology. We compute the luminosity distance-redshift relation in a perturbed flat matter-dominated Universe, taking into account the presence of cosmological inhomogeneities up to second order in perturbation theory. Cosmological observations implementing the luminosity distance-redshift relation tell us that the Universe is presently undergoing a phase of accelerated expansion. This seems to call for a mysterious Dark Energy component with negative pressure. Our findings suggest that the need of a Dark Energy fluid may be challenged once a realistic inhomogeneous Universe is considered and that an accelerated expansion may be consistent with a matter-dominated Universe.
|Titolo:||Effect of inhomogeneities on the luminosity distance-redshift relation: is dark energy necessary in a perturbed universe?|
|Autori:||Barausse, E.; Matarrese, S.; Riotto, A.|
|Data di pubblicazione:||2005|
|Numero di Articolo:||063537,|
|Digital Object Identifier (DOI):||10.1103/PhysRevD.71.063537|
|Appare nelle tipologie:||1.1 Journal article|