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For someone familiar with basic QFT and GR and semi-classical physics but doesn't know string theory nor AdS/CFT is there some intuitive way to think about what the microstate of a black hole means?

Since these are microstates, temperature will not be defined for them. Does their geometry still have a horizon with a finite area? if yes then how is the area-entropy- temperature relationship interpreted in this new conceptual regime?

Do they have singularities or not?

(How) can they be formed? by "collapse"?

Are they classical geometries or inherently quantum in nature? (The ones studied in AdS/CFT would have to be classical since the bulk is in the classical limit right?)

Any intuition apart from the specific questions mentioned would also be appreciated.

(P.S. I understand these are a lot of questions and I don't expect all to be answered but asking them separately doesn't seem to make any sense to me either.)

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    $\begingroup$ Well, it would depend on your specific theory of quantum gravity. $\endgroup$ – Javier Aug 28 at 13:46
  • $\begingroup$ @Javier Could you mention the features in some of the prominent approaches ? $\endgroup$ – alex Aug 28 at 13:59
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    $\begingroup$ Whether for experts or non-experts, this question doesn't have a definitive answer yet, as far as I know. But if you'd like some food for thought, then you might enjoy reading these papers by Mathur (keyword "fuzzballs"): Resolving the black hole causality paradox, Black Holes and Beyond, and The information paradox: conflicts and resolutions. Papers in this series try to paint a picture of individual black hole microstates. $\endgroup$ – Chiral Anomaly Aug 30 at 3:25

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