We investigate the impact of a nonstandard time evolution of the dark matter component on current cosmological bounds from cosmic microwave background (CMB) anisotropies. We found that a less than 0.1% variation in the effective dark matter equation of state w(dm) can drastically change current CMB bounds on the matter density, the Hubble parameter and the age of the Universe. A flat universe without dark energy could provide an excellent fit to current CMB data, providing that w(dm) similar to -10(-2).

Cosmological constraints on the matter equation of state / Calabrese, Erminia; Marina, Migliaccio; Pagano, Luca; Grazia De, Troia; Melchiorri, Alessandro; Paolo, Natoli. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - 80:6(2009), pp. 063539-063542. [10.1103/physrevd.80.063539]

Cosmological constraints on the matter equation of state

CALABRESE, ERMINIA;PAGANO, LUCA;MELCHIORRI, Alessandro;
2009

Abstract

We investigate the impact of a nonstandard time evolution of the dark matter component on current cosmological bounds from cosmic microwave background (CMB) anisotropies. We found that a less than 0.1% variation in the effective dark matter equation of state w(dm) can drastically change current CMB bounds on the matter density, the Hubble parameter and the age of the Universe. A flat universe without dark energy could provide an excellent fit to current CMB data, providing that w(dm) similar to -10(-2).
2009
01 Pubblicazione su rivista::01a Articolo in rivista
Cosmological constraints on the matter equation of state / Calabrese, Erminia; Marina, Migliaccio; Pagano, Luca; Grazia De, Troia; Melchiorri, Alessandro; Paolo, Natoli. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - 80:6(2009), pp. 063539-063542. [10.1103/physrevd.80.063539]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/361715
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