Effect of inhomogeneities on the luminosity distance-redshift relation: Is dark energy necessary in a perturbed universe?
- Dipartimento di Fisica 'G. Galilei', Universita di Padova, via Marzolo 8, Padova I-35131 (Italy) and SISSA/ISAS, via Beirut 4, I-34014 Trieste (Italy)
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.
- OSTI ID:
- 20706204
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 71, Issue 6; Other Information: DOI: 10.1103/PhysRevD.71.063537; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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