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2023

Comprehensive Constraints on Dark Radiation Injection After BBN

Sobotka, Alexander C., Erickcek, Adrienne L., Smith, Tristan L.

Understand

We derive constraints on the injection of free-streaming dark radiation after big bang nucleosynthesis (BBN) by considering the decay of a massive hidden sector particle into dark radiation.

Such a scenario has the potential to alleviate the Hubble tension by introducing a new energy component to the evolution of the early universe.
We employ observations of the cosmic microwave background (CMB) from $\textit{Planck}$ 2018 and the South Pole Telescope (SPT-3G), measurements of the primordial deuterium abundance, Pantheon+ Type Ia supernovae data, and baryon acoustic oscillation (BAO) measurements from BOSS DR12 to constrain these decay scenarios.
Pre-recombination decays are primarily restricted by observations of the CMB via their impact on the effective number of relativistic species.