Very high energy gamma-rays and the Hubble parameter

Details Very high energy gamma-rays and the Hubble parameter Very high energy gamma-rays and the Hubble parameter

2010-01-18

arxiv.org/abs/1001.2973v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Proc. of the 12th Marcel Grossmann meeting on general relativity. 3 pages, 1 figure

Scientific paper

A new method, based on the absorption of very high-energy gamma-rays by the cosmic infrared background, is proposed to constrain the value of the Hubble constant. As this value is both fundamental for cosmology and still not very well measured, it is worth developing such alternative methods. Our lower limit at the 68% confidence level is H0 > 74 km/s/Mpc, leading, when combined with the HST results, to H0 ~ 76 km/s/Mpc. Interestingly, this value, which is significantly higher than the usually considered one, is in exact agreement with other independent approaches based on baryonic acoustic oscillations and X-ray measurements. Forthcoming data from the experiments HESS-2 and CTA should help improving those results. Finally, we briefly mention a plausible correlation between absorption by the extragalactic background light and the absence of observation of gamma-ray bursts (GRBs) at very high energies.

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