Lecture XXIV: External appearance of a black hole
نویسنده
چکیده
We now consider the problem of the appearance of a black hole formed by a collapsing star. Our interest today lies entirely with the appearance of the star long after its collapse, or alternatively of the radiation emitted as the star crosses the Schwarzschild radius. We first show that in geometric optics, the surface of the doomed star remains forever visible with exponentially decreasing brightness and increasing redshift. At some point, wave optics becomes important, and so we then treat that case as well. Reading: • MTW Ch. 31. • This is not really reading material for this course, but the moving mirror example is from §4.4 of Birrell & Davies, Quantum fields in curved spacetime.
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