We explicate the Kruskal-Szekeres change of coordinates that show that the Schwarzschild black hole event horizon is not a singularity. In these coordinates,we can also construct a time-reversed "white hole".
(video from part 1: https://youtu.be/gEXErlGb7vI?si=Fcx2JG35FOdjDke5(link is external) )
Speaker: Floyd Williams
Institution: UMass Amherst, Math & Stat
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