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  1. Dec 24, 2011 #1
    This is a question about something in Sean Carrol's Spacetime and Geometry text. I'll quote here:

    " ... current estimates of the maximum possible neutron-star mass are around 3-4 Ms, the Oppenheimer-Volkofflimit. Since a fluid of neutrons is the densest material we know about (apart from some very speculative suggestions), it is believed that the outcome of such a collapse is a black hole"

    I was just curious about the part in bold. Anybody familar with these "speculative suggestions".

  2. jcsd
  3. Dec 24, 2011 #2


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    Try googling on some of the following: black stars, gravastars, fuzzballs, quark stars, boson stars, Q-balls, and electroweak stars.
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