3 papers
astro-ph.CO2026
Less isn't more: Cosmological bounds on the neutrino masses are robust to changes in the neutrino abundance
Sebastian J. Figueroa, Alexander C. Sobotka, Adrienne L. Erickcek
We investigate how neutrino-mass constraints from cosmology depend on the assumed thermal history of the universe. Photon injection after neutrino decoupling would decrease the neu…
astro-ph.CO2024
Signatures of Very Early Dark Energy in the Matter Power Spectrum
Alexander C. Sobotka, Adrienne L. Erickcek, Tristan L. Smith
Axion-like scalar fields can induce temporary deviations from the standard expansion history of the universe. The scalar field's contribution to the energy density of the universe…
astro-ph.CO2023
Comprehensive Constraints on Dark Radiation Injection After BBN
Alexander C. Sobotka, Adrienne L. Erickcek, Tristan L. Smith
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…