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An original constraint on the Hubble constant: h>0.74
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An original constraint on the Hubble constant: h>0.74
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The Hubble parameter H0 still not very well measured. Although the Hubble Key Project, Chandra and WMAP gave good estimates, the uncertainties remain quite large. In this brief report, we suggest an original and independent method to derive a lower limit on H0 using the absorption of very high energy gamma-rays by the cosmic infrared background. With conservative hypothesis, we obtain H0>74 km/s/Mpc at the 68% confidence level, which favors the upper end of the intervals allowed by dedicated experiments.
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Cited by 1 Pith paper
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Constraining cosmological parameters from very-high-energy $\gamma$-ray attenuation in blazar spectra: Bayesian inference and systematic uncertainties
Gamma-ray attenuation in 241 blazar spectra constrains the combined opacity/Hubble ratio r=1.723^{+0.096}_{-0.095}, giving H0=58.3^{+3.4}_{-3.0} km/s/Mpc (fixed EBL) or 60.5^{+10.8}_{-10.0} with an 18% EBL-scale uncertainty.
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