In this seminar I will present my work on the formation of magnetized compact objects in collapsing massive stars through relativistic MHD simulations, highlighting the dynamical impact of both magnetic fields and rotation, the signatures they leave in the emitted gravitational waves and neutrinos, and the properties of the ejected heavy elements formed during the explosion. I will then present my numerical studies on turbulent dynamos in accretion disks around rotating black holes, the onset of large-scale fluid instabilities in relativistic accretion flows, and the propagation of relativistic jets, along with my contributions to the advancement of the GRMHD framework through the « Event Horizon Telescope » code comparison and the GRMHD module of the GPU-accelerated code gPLUTO. I will also show my recent work on relativistic magnetic reconnection, including 3D tearing mode dynamics and the first relativistic MHD simulations using an effective resistivity derived from particle-in-cell simulations, which lead to a quantitative agreement with fast reconnection rates typically expected only from kinetic simulations.
Finally, I will conclude by introducing my recently-started ERC project « BlackJET », which aims at building a unified description of long gamma-ray bursts (i.e. from the stellar collapse to the electromagnetic emission), thus addressing some of the most important open questions in GRB astronomy (such as the nature of the central compact engine and the physical mechanism responsible for the GRB prompt emission).
DAp, AIM