Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2009-01-28
PoS BHs,GRandStrings 2008:001,2008
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
V1: 16 pages; 7 figures; Introductory survey talk at the workshop: "Black Holes in General Relativity and String Theory", 24-3
Scientific paper
What is going on (as of August 2008) at the interface between theoretical general relativity, string-inspired models, and observational astrophysics? Quite a lot. In this mini-survey I will make a personal choice and focus on four specific questions: Do black holes "exist"? (For selected values of the word "exist".) Is black hole formation and evaporation unitary? Can one mimic a black hole to arbitrary accuracy? Can one detect the presence of a horizon using local physics?
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