Gravastar

Em astrofísica, a hipótese dos gravastar é uma proposta de Pawel Mazur e Emil Mottola como alternativa aos buracos negros. Resulta de supor limitações físicas reais na formação de buracos negros. Estes limites, tais como um comprimento e tempo quântico (chronon) discretos, não eram conhecidos quando os buracos negros foram originalmente teorizados, então o conceito é uma tentativa de "modernização" da teoria por incorporar a mecânica quântica. No lugar de uma estrela colapsando em um ponto do espaço com uma gravidade virtualmente infinita (singularidade gravitacional), esta hipótese propõe que quando um objeto colapsa gravitacionalmente, o próprio espaço chega a uma transição de fase que limita a continuidade do colapsamento. O termo gravastar deriva-se das palavras Gravitational Vacuum Star (em inglês, estrela de vácuo gravitacional).[1]

Ver também

Referências

  1. «Los Alamos researcher says 'black holes' aren't holes at all». www.lanl.gov. Consultado em 28 de fevereiro de 2008  (em inglês)

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