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Progress toward an accurate Hubble Constant

Published online by Cambridge University Press:  16 July 2018

Sherry H. Suyu
Sherry H. Suyu*
Affiliation:
Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85748 Garching, Germany email: suyu@mpa-garching.mpg.de Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617, Taiwan Physik-Department, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany
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Abstract

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The Hubble constant is a key cosmological parameter that sets the present-day expansion rate as well as the age, size, and critical density of the Universe. Intriguingly, there is currently a tension in the measurements of its value in the standard flat ΛCDM model – observations of the Cosmic Microwave Background with the Planck satellite lead to a value of the Hubble constant that is lower than the measurements from the local Cepheids-supernovae distance ladder and strong gravitational lensing. Precise and accurate Hubble constant measurements from independent probes, including water masers, are necessary to assess the significance of this tension and the possible need of new physics beyond the current standard cosmological model. We present the progress toward an accurate Hubble constant determination.

Keywords

gravitational lensingmasers(cosmology:) cosmic microwave background(cosmology:) cosmological parameters(cosmology:) distance scale
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S336: Astrophysical Masers: Unlocking the Mysteries of the Universe , September 2017 , pp. 80 - 85
Copyright
Copyright © International Astronomical Union 2018 

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