Prof. Ingemar Bengtsson (University of Stockholm) :Trapped surfaces in simple collapse situations
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Europe/Budapest
Tanacsterem
Tanacsterem
Description
Given an evolving black hole there is a region of spacetime such that a
trapped surface passes through every point in the region. What is the
boundary of this region? I will discuss this question for spherically
symmetric spacetimes; it seems to be easy to answer for outer trapped
surfaces, but it is non-trivial for trapped surfaces with both null
expansions negative. If there is time I might also mention some results
for a 2+1 dimensional toy model, where one can do without any symmetry
assumptions.