3 papers
hep-ph2026
Warm dark matter from freeze-in at stronger coupling
Duarte Feiteira, Oleg Lebedev, VinÃcius Oliveira
We study warm Higgs portal dark matter (DM) in the framework of freeze-in at stronger coupling. This scenario assumes that the Standard Model thermal bath temperature has always be…
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
Invisible Higgs decay from dark matter freeze-in at stronger coupling
Oleg Lebedev, António P. Morais, VinÃcius Oliveira +1
We study the Higgs boson decay into dark matter (DM) in the framework of freeze-in at stronger coupling. Even though the Higgs-DM coupling is significant, up to order one, DM does…