arXiv Cosmology and Nongalactic Astrophysics
arXiv Cosmology and Nongalactic Astrophysics
5 years ago

A new measurement of the Hubble constant and matter content of the Universe using extragalactic background light -ray attenuation. (arXiv:1903.12097v2 [astro-ph.CO] UPDATED)

Alberto Domínguez (UC Madrid), Radoslaw Wojtak, Justin Finke, Marco Ajello, Kari Helgason, Francisco Prada, Abhishek Desai, Vaidehi Paliya, Lea Marcotulli, Dieter Hartmann
The Hubble constant and matter density of the Universe are measured using the latest -ray attenuation results from Fermi-LAT and Cherenkov telescopes. This methodology is based upon the fact that the extragalactic background light supplies opacity for very high energy photons via photon-photon interaction. The amount of -ray attenuation along the line of sight depends on the expansion rate and matter content of the Universe. This novel strategy results in a value of ~km~s ~Mpc and . These estimates are independent and complementary to those based on the distance ladder, cosmic microwave background (CMB), clustering with weak lensing, and strong lensing data. We also produce a joint likelihood analysis of our results from rays and these from more mature methodologies, excluding the CMB, yielding a combined value of ~km~s ~Mpc and .

Publisher URL: http://arxiv.org/abs/1903.12097

DOI: arXiv:1903.12097v2

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