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Do we need to expand the cosmological standard model? New cepheid observations suggest yes

29 Jan 2020, 13:00 UTC
Do we need to expand the cosmological standard model? New cepheid observations suggest yes
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Title: Large Magellanic Cloud Cepheid Standards Provide a 1% Foundation for the Determination of the Hubble Constant and Stronger Evidence for Physics beyond ΛCDMAuthors: Adam G. Riess, Stefano Casertano, Wenlong Yuan, Lucas M. Macri, and Dan ScolnicFirst Author’s Institution: Space Telescope Science Institute, Baltimore, USA and John Hopkins University, Baltimore, USAStatus: Published in ApJ [open access]
The “Hubble Trouble”The Hubble constant H0 describes the rate at which the universe expands today. It is a fundamental parameter of the standard model of cosmology, the ΛCDM-model, which is well supported by a range of observations. However, in recent years there has been a controversy surrounding H0, called “Hubble Trouble” by popular media and “H0 Tension” by scientists. It comprises the discrepancy between measurements of the Hubble parameter by the Planck satellite (67.4 ± 0.5 km/s/Mpc ) and in the local universe (72.04 ± 2.67 km/s/Mpc). Up to now, this discrepancy was less than 3σ and could still be explained by a statistical fluke. In today’s paper, however, Adam Riess and his co-authors reduced the error bars on their measurement of H0 in the local universe and found that the discrepancy to the Planck measurement increases to what they call “beyond a plausible ...

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