Black holes: from event horizons to trapping horizons - LUTH ...
Black holes: from event horizons to trapping horizons - LUTH ...
Black holes: from event horizons to trapping horizons - LUTH ...
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Local approaches <strong>to</strong> black <strong>holes</strong><br />
What is a trapped surface ?<br />
1/ Expansion of a surface along a normal vec<strong>to</strong>r field<br />
1 Consider a spacelike 2-surface S<br />
(induced metric: q)<br />
2 Take a vec<strong>to</strong>r field v defined on<br />
S and normal <strong>to</strong> S at each<br />
point<br />
Eric Gourgoulhon (<strong>LUTH</strong>) <strong>Black</strong> <strong>holes</strong>: <strong>trapping</strong> <strong>horizons</strong> CERN, 17 March 2010 10 / 38
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