GRB Central Engines and Electromagnetic Transients

Explore the intricacies of gamma-ray burst (GRB) central engines and their electromagnetic transients in this 55-minute lecture by Dr. Narges Shahamat from Isfahan University of Technology and Iranian National Observatory. Delve into the world of massive hyper-accretion disks around black holes, focusing on Neutrino Dominated Accretion Flows and their physical characteristics. Examine the effects of self-gravity and magnetic fields on these dense accretion flows, and investigate mechanisms leading to late-time X-ray flares. Learn about the potential for disk fragmentation and its role in producing X-ray flare light curves. Discover how neutrino viscosity and self-gravity may contribute to the formation of a clumpy inner disk structure, potentially explaining the variability in prompt emission light curves. Gain insights into General Relativistic Magneto-Hydro Dynamics (GRMHD) models of collapsars and their relevance to Long Gamma Ray Bursts, including the impacts of self-gravity, gravitational instability, and magnetic field configurations on the evolution of newly formed black holes.