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Fuzzballs to Firewalls: A Post-Firewall Review of the Fuzzball Proposal: Lecture 2

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The fuzzball proposal makes a conjecture about the nature of black hole
microstates. Now, more than a decade old and including several different

philosophies and perspectives, it is especially relevant after the recent

firewall argument and ensuing debate. Over three lectures, I plan to start
with a very general discussion of the general ideas and motivations, then
review the theoretical evidence from string theory, and finally close by
discussing open questions, including the fate of a freely falling observer
as he/she passes through the black hole horizon.