Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2010-04-12
JCAP 1010:024,2010
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
29 pages, 13 figures
Scientific paper
We update constraints on cosmic opacity by combining recent SN Type Ia data compilation with the latest measurements of the Hubble expansion at redshifts between 0 and 2. The new constraint on the parameter $\epsilon$ parametrising deviations from the luminosity-angular diameter distance relation ($d_L=d_A(1+z)^{2+\epsilon}$), is $\epsilon=-0.04_{-0.07}^{+0.08}$ (2-$\sigma$). For the redshift range between 0.2 and 0.35 this corresponds to an opacity $\Delta\tau<0.012$ (95% C.L.), a factor of 2 stronger than the previous constraint. Various models of beyond the standard model physics that predict violation of photon number conservation contribute to the opacity and can be equally constrained. In this paper we put new limits on axion-like particles, including chameleons, and mini-charged particles.
Avgoustidis Anastasios
Burrage Clare
Jimenez Raul
Redondo Javier
Verde Licia
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