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F.-Y. Cyr-Racine and K. Sigurdson, “Limits on Neutrino-Neutrino Scattering in the Early Universe,” Phys. Rev. D
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S. Hannestad, R. S. Hansen, and T. Tram, “How Self-Interactions can Reconcile Sterile Neutrinos with Cosmology,” Phys. Rev. Lett
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Then

E. Di Valentino, O. Mena, S. Pan, L. Visinelli, W. Yang, A. Melchiorri, D. F. Mota, A. G. Riess, and J. Silk, “In the realm of the Hubble tension—a review of solutions,” Class. Quant. Grav
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2021
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W. L. Freedman, “Measurements of the Hubble Constant: Tensions in Perspective,” Astrophys. J
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2021
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M. Escudero and S. J. Witte, “The hubble tension as a hint of leptogenesis and neutrino mass generation,” Eur. Phys. J. C
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2021
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B. Dasgupta and J. Kopp, “Sterile Neutrinos,” Phys. Rept
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A. G. Riess et al
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2024

Cosmological probes of Dark Radiation from Neutrino Mixing

Allali, Itamar J., Aloni, Daniel, Schöneberg, Nils

Understand

Models of stepped dark radiation have recently been found to have an important impact on the anisotropies of the cosmic microwave background, aiding in easing the Hubble tension.

In this work, we study models with a sector of dark radiation with a step in its abundance, which thermalizes after big bang nucleosynthesis by mixing with the standard model neutrinos.
For this, we extend an earlier work which has focused on the background evolution only until the dark sector thermalizes by deriving the full background and perturbation equations of the model and implementing them in an Einstein-Boltzmann solving code.
We expound on the behavior of this model, discussing the wide range of parameters that result in interesting and viable cosmologies that dynamically generate dark radiation during a range of epochs.