3 papers
astro-ph.HE2026
The Axion-Photon Mixing and the Extragalactic Magnetic Background: Plateau Regimes, Resonances, and Non-Gaussian Boosts
Andrea Addazi, Yi-Fu Cai, Salvatore Capozziello +2
We present an analytical treatment of Axion-Like-Particle (ALP)--photon mixing with extragalactic background light (EBL) attenuation for constant, Gaussian-stochastic, and non-Gaus…
astro-ph.CO2025
Primordial Black Hole Formation from the Upward Step Model: Avoiding Overproduction
Xiaoding Wang, Xiao-Han Ma, Yi-Fu Cai
We investigate the formation of primordial black holes (PBHs) in an upward step inflationary model, where nonlinearities between curvature perturbations and field fluctuations intr…
astro-ph.CO2024
Gravitational waves from primordial black hole isocurvature: the effect of non-Gaussianities
Xin-Chen He, Yi-Fu Cai, Xiao-Han Ma +3
Ultra-light primordial black holes (PBHs) with masses can dominate transiently the energy budget of the Universe and reheat the Universe throug…