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Is the Hubble Tension actually a Temperature Tension?

27 Jun 2020, 06:33 UTC
Is the Hubble Tension actually a Temperature Tension?
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Title: H0 tension or T0 tension?Authors: Mikhail M. Ivanov, Yacine Ali-Haı̈moud, and Julien LesgourgesFirst Author’s Institution: Center for Cosmology and Particle Physics, Department of Physics, New York University, New York City, USA and Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, RussiaStatus: Submitted to arXiv [open access]One of the most prominent issues in cosmology is the so-called “Hubble Tension”. It represents an unsolved issue in cosmology: Measurement of the Hubble constant H0, which tells us how fast the Universe is expanding, do not agree with each other. Observations of the cosmic microwave background (CMB) made by the Planck satellite suggest a value of 67.4 ± 0.5 km/s/Mpc, while observations of supernovae and cepheids by the SH0ES team suggest a higher value of 73.5 ± 1.4 km/s/Mpc (see this astrobite as well as this one for a description of H0 measurements with cepheids and supernovae). This tension between these measurements is a problem for the cosmological standard model In this model the two measurements should coincide. If they are not the same, the standard model might need to be adjusted. However, the authors of today’s paper discuss the possibility that the Hubble tension is actually caused by prior ...

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