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Dark Radiation from Neutrino Mixing after Big Bang Nucleosynthesis

https://doi.org/10.1103/PhysRevLett.131.221001

Aloni, Daniel; Joseph, Melissa; Schmaltz, Martin; Weiner, Neal (November 2023, Physical Review Letters)

Light dark fermions can mass mix with the standard model (SM) neutrinos. As a result, through oscillations and scattering, they can equilibrate in the early universe. Interactions of the dark fermion generically suppress such production at high temperatures but enhance it at later times. We find that for a wide range of mixing angles and interaction strengths equilibration with SM neutrinos occurs at temperatures near the dark fermion mass. For masses below an MeV, this naturally occurs after nucleosynthesis and opens the door to a variety of dark sector dynamics with observable imprints on the CMB and large scale structure, and with potential relevance to the tensions in H0 and S8.
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A Step in understanding the $S_{8}$ tension

https://doi.org/10.1103/PhysRevD.108.023520

Joseph, Melissa; Aloni, Daniel; Schmaltz, Martin; Sivarajan, Eashwar N.; Weiner, Neal (July 2023, Physical Review D)
A Step in understanding the Hubble tension

https://doi.org/10.1103/PhysRevD.105.123516

Aloni, Daniel; Berlin, Asher; Joseph, Melissa; Schmaltz, Martin; Weiner, Neal (June 2022, Physical Review D)

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Cosmology intertwined: A review of the particle physics, astrophysics, and cosmology associated with the cosmological tensions and anomalies

https://doi.org/10.1016/j.jheap.2022.04.002

Abdalla, Elcio; Abellán, Guillermo Franco; Aboubrahim, Amin; Agnello, Adriano; Akarsu, Özgür; Akrami, Yashar; Alestas, George; Aloni, Daniel; Amendola, Luca; Anchordoqui, Luis A.; et al (June 2022, Journal of High Energy Astrophysics)

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