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Forums
Physics
Special and General Relativity
Penrose Process: Unlocking the Mystery
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[QUOTE="PeterDonis, post: 5491905, member: 197831"] Not for all photons. It's a surface at which a photon that is moving purely radially outward will have infinite redshift. (Note that this is a heuristic description and has significant limitations, but it will do for this discussion.) But a photon coming out from the ergosphere will not be moving purely radially. It will have a positive angular velocity, i.e., it will have a component of its motion which is angular, in the same direction as the rotation of the hole. So it can escape to infinity just fine. [/QUOTE]
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Special and General Relativity
Penrose Process: Unlocking the Mystery
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