Speaker
Description
Turbulent coronae around supermassive black holes can accelerate non-thermal particles to high energies and power observable emission, but the comparable timescales of acceleration, cooling, and electromagnetic cascades make this process hard to capture. In this seminar, I will introduce a time-dependent framework that self-consistently couples proton acceleration—modeled with the Fokker–Planck equation—to lepto-hadronic radiation and cascading. Applied to the neutrino-emitting active galactic nucleus (AGN) NGC 1068, the model reproduces IceCube’s observed neutrino spectrum while remaining consistent with gamma-ray limits. I will also discuss a transient-corona scenario, potentially arising in non-jetted tidal disruption events such as AT 2019dsg, where early cascade feedback regulates proton acceleration in weaker coronae and imprints delayed optical/UV, X-ray, and neutrino signals on ~100-day timescales. The framework efficiently models multi-messenger emission from both steady and transient sources, offering a flexible way to connect particle-acceleration physics with radiation mechanisms in AGN and TDE environments.
