Speaker
Description
Over the last decades, it has been established that dark matter (DM) rearranges around compact objects, forming over-densities known as spikes. We focus on the framework based on the Ruffini-Argüelles-Rueda (RAR) model, where the quantum nature of keV-fermions leads to a distinct core-halo morphology. In this context, we address the scenario where a central Supermassive Black Hole (SMBH) —originating either from baryonic mechanisms or from the gravitational collapse of the dense degenerate core— grows adiabatically over timescales $\sim 10^7$ yr. Using a comprehensive phase-space approach in General Relativity, we compute the resulting distribution of these fermionic spikes and show that their final morphology is highly sensitive to the quantum nature and physical regime of the particles. We discuss the astrophysical implications of these dense structures on their immediate environment, consistent with observables at $z=0$.