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).

Calabrese, E., Migliaccio, M., Pagano, L., De Troia, G., Melchiorri, A., Ro, ., et al. (2009). Cosmological constraints on the matter equation of state. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 80(6) [10.1103/PhysRevD.80.063539].

Cosmological constraints on the matter equation of state

Migliaccio, Marina;De Troia, Grazia;Natoli, Paolo
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).
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/05 - Astronomia e Astrofisica
English
Calabrese, E., Migliaccio, M., Pagano, L., De Troia, G., Melchiorri, A., Ro, ., et al. (2009). Cosmological constraints on the matter equation of state. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 80(6) [10.1103/PhysRevD.80.063539].
Calabrese, E; Migliaccio, M; Pagano, L; De Troia, G; Melchiorri, A; Ro, ; Natoli, P
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/216755
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