GRMHD Study of Accretion onto Time-like Naked Singularities

Abstract Naked singularities (NkSs) 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 (BH) shadows. In this work, we investigate the accretion dynamics of selected time-like NkSs using general relativistic magnetohydrodynamic simulations. Our objective is to determine whether NkSs exhibit distinct signatures compared to BHs. We find that, unlike BHs, NkSs exhibit a centrifugal barrier that prevents direct accretion of rotating matter onto the NkSs. Despite reduced magnetization in the funnel region, these objects are capable of generating jet powers comparable to those observed in BHs. Additionally, we observe that accreting matter releases gravitational energy as it is driven toward the NkSs, powering the strong outflow via local fluid pressure gradient or magnetic pressure forces.