What lessons do we have from string theory regarding the fate of singularities in general relativity?

What happens to black hole singularities? What happens to cosmological singularities?

Which points of view on string theory yielded results in this respect? String field theory? AdS/CFT? Matrix theory? I suppose perturbative string theory is not applicable in the vicinity of singularities.

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    $\begingroup$ Is there a way to narrow this down? The story of timelike singularities (orbifolds, conifolds etc.) is well digested and you are asking for a review of thousands of papers. Are you maybe interested in more specific types of singularities? $\endgroup$
    – user566
    Oct 26, 2011 at 20:18
  • $\begingroup$ Well, I mentioned black hole and cosmological singularities which are spacelike. Indeed I'm interested only in the spacelike case. $\endgroup$
    – Squark
    Oct 26, 2011 at 21:00
  • $\begingroup$ Excellent, thanks, this does narrow it down quite a bit... $\endgroup$
    – user566
    Oct 26, 2011 at 21:02
  • $\begingroup$ Also, my 1st sentence alludes to the classical problem of singularities in general relativity which a theory of quantum gravity is supposed to solve. Compactification on singular manifolds (which I think you're referring to) is a way to introduce an additional sort of singularities special to string theory (more generally Kaluza-Klein) and unnecessary in classical general relativity. $\endgroup$
    – Squark
    Oct 26, 2011 at 21:03
  • $\begingroup$ That’s kind of semantics, but spacelike singularities is definitely a well-defined characterization. $\endgroup$
    – user566
    Oct 26, 2011 at 21:06


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