3 papers
hep-ph2025
Cosmological gravitational particle production: Starobinsky vs Bogolyubov, uncertainties, and issues
Duarte Feiteira, Oleg Lebedev
We study production of free and feebly interacting scalars during inflation using the Bogolyubov coefficient and Starobinsky stochastic approaches. While the two methods agree in t…
hep-ph2024
-mediated dark matter freeze-in at stronger coupling
Giorgio Arcadi, David Cabo-Almeida, Oleg Lebedev
We study freeze-in production of fermionic dark matter mediated by a gauge boson. In particular, we explore the regime of Boltzmann-suppressed production, when the Stand…
hep-ph2024
Higgs Portal Dark Matter Freeze-in at Stronger Coupling: Observational Benchmarks
Giorgio Arcadi, Francesco Costa, Andreas Goudelis +1
We study freeze-in production of Higgs portal dark matter (DM) at temperatures far below the dark matter mass. The temperature of the Standard Model (SM) thermal bath may have neve…