We investigate the weak cosmic censorship conjecture by analyzing the dynamics of spinning timelike particles dropped along the rotational axis of an extremal Kerr-(anti-)de Sitter black hole. This idea was first considered in a seminal paper by Wald and later by Needham but both analyses were restricted to asymptotically flat spacetimes. We generalize these studies, involving spinning particles, to rotating spacetimes with non vanishing cosmological constant. We examine whether the absorption of such particles can overspin the black hole beyond extremality, potentially leading to the formation of a naked singularity. In asymptotically de Sitter spacetime, we find that particles that are captured cannot overspin the black hole. Similar conclusions hold also with anti-de Sitter asymptotics, but the analysis is more subtle, requiring careful consideration of the point particle approximation.

--

Naked singularities,Weak cosmic censorship tests,Extremal black hole,Kerr-de sitter,Kerr-Anti de sitter,Spinning particles

• Ciências Físicas - Ciências Naturais

Esta publicação é um output do(s) seguinte(s) projeto(s):

• Buracos negros, ondas gravitacionais e transições de fase