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2021

Solving the Hubble tension without spoiling Big Bang Nucleosynthesis

Huang, Guo-yuan, Rodejohann, Werner

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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 $\Delta N^{}_{\rm eff}$ during recombination.
However, the amount of $\Delta N^{}_{\rm eff}$ 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.

Solving the Hubble tension without spoiling Big Bang Nucleosynthesis · Around

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