Thermal friction as a solution to the Hubble tension

Thermal friction as a solution to the Hubble tension

A new component added to the standard model of cosmology that behaves like a cosmological constant at early times and then dilutes away as radiation or faster can resolve the Hubble tension. We show that a rolling axion coupled to a non-Abelian gauge group exhibits the behavior of such an extra comp...

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Veröffentlicht in:Physical review. D 2020-04, Vol.101 (8), Article 083537
Hauptverfasser: Berghaus, Kim V., Karwal, Tanvi
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Sprache:eng
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Astronomical models
Cosmic microwave background
Cosmological constant
Cosmology
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container_title Physical review. D
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creator Berghaus, Kim V.
Karwal, Tanvi
description A new component added to the standard model of cosmology that behaves like a cosmological constant at early times and then dilutes away as radiation or faster can resolve the Hubble tension. We show that a rolling axion coupled to a non-Abelian gauge group exhibits the behavior of such an extra component at the background level and can present a natural particle-physics model solution to the Hubble tension. We compare the contribution of this bottom-up model to the phenomenological fluid approximation and determine that CMB observables sensitive only to the background evolution of the Universe are expected to be similar in both cases, strengthening the case for this model to provide a viable solution to the Hubble tension.
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subjects Astronomical models
Cosmic microwave background
Cosmological constant
Cosmology
title Thermal friction as a solution to the Hubble tension
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