Solving the Hubble tension without spoiling big bang nucleosynthesis

Huang, Guoyuan; Rodejohann, Werner

doi:10.1103/PhysRevD.103.123007

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Solving the Hubble tension without spoiling big bang nucleosynthesis

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Huang, Guoyuan
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Rodejohann, Werner
Werner Rodejohann - ERC Starting Grant, Junior Research Groups, MPI for Nuclear Physics, Max Planck Society;

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Citation

Huang, G., & Rodejohann, W. (2021). Solving the Hubble tension without spoiling big bang nucleosynthesis. Physical Review D, 103(12): 123007. doi:10.1103/PhysRevD.103.123007.

Cite as: https://hdl.handle.net/21.11116/0000-000A-4C0A-7

Abstract

The Hubble parameter inferred from cosmic microwave background
observations is consistently lower than that from local measurements,
which could hint towards new physics. Solutions to the Hubble tension
typically require a sizable amount of extra radiation Delta N-eff during
recombination. However, the amount of Delta N-eff in the early Universe
is unavoidably constrained by big bang nucleosynthesis (BBN), which
causes problems for such solutions. We present a possibility to evade
this problem by introducing neutrino self-interactions via a simple
Majoron-like coupling. The scalar is slightly heavier than 1 MeV and
allowed to be fully thermalized throughout the BBN era. The rise of
neutrino temperature due to the entropy transfer via phi -> nu(nu) over
bar reactions compensates for the effect of a large Delta N-eff on BBN.
Values of Delta N-eff as large as 0.7 are in this case compatible with
BBN. We perform a fit to the parameter space of the model.