GRMHD Study of Accretion onto time-like Naked Singularities

Abstract

Naked singularities (NkS) are solutions to the Einstein field equations that violate the cosmic censorship conjecture. Recent studies indicate that these objects may serve as compelling mimickers of black hole shadows. In this work, we investigate the accretion dynamics of selected time-like naked singularities using general relativistic magnetohydrodynamic (GRMHD) simulations. Our objective is to determine whether naked singularities exhibit distinct signatures compared to black holes. We find that, unlike black holes, naked singularities exhibit a centrifugal barrier that prevents direct accretion of rotating matter onto the NkS. Despite reduced magnetization in the funnel region, these objects are capable of generating jet powers comparable to those observed in black holes. Additionally, we observe that accreting matter releases gravitational energy as it is driven towards the NkS, powering the strong outflow via local fluid pressure gradient or magnetic pressure forces.