Tomas Vencl's latest activity
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TTomas Vencl replied to the thread I Euclidean geometry and gravity.I do not understand, how we choose the exact position of each infinitensimal part, where it hovers ? How we measure , that it is at...
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TTomas Vencl replied to the thread I Euclidean geometry and gravity.Yes, but are not the tidal gravity forces just those originating from the difference between flat and curved spacetime ?
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TI agree this is the fundamental question. I lean in the same direction as you (@pervect ). [This would mean that Herglotz-Noether...
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TConsider two separate objects held static against gravity by external forces. Now you connect them with a beam of negligible mass. The...
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TMy intuition leads to a similar conclusion, but I think we would need to clarify what a "beam" is in this context. I am not sure I have...
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TTomas Vencl replied to the thread I An invariant while crossing the horizon.Yes, thank you all. The infalling observer’s proper time (\tau_1) is ultimately not important. What matters is that all observers agree...
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TTomas Vencl replied to the thread I An invariant while crossing the horizon.Yes, that exactly is the point of the question.
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TTomas Vencl posted the thread I An invariant while crossing the horizon in Special and General Relativity.While reading the neighboring thread I came up with the following question: consider an evaporating black hole and an observer falling...
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TTomas Vencl reacted to martinbn's post in the thread B How can a black hole absorb matter? with
Like.
The way I understood @JimWhoKnew point is that given an observer, who stays out of the hole, there are no events on the EH, which are in... -
TTomas Vencl replied to the thread B How can a black hole absorb matter?.As JimWhoKnew has already noted: In other words, this scenario assumes that the photons emitted from the shell itself during the...
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TTomas Vencl reacted to JimWhoKnew's post in the thread B How can a black hole absorb matter? with Like.
The event horizon is a global concept and can never be in the causal past of external observers. (Ignoring the possibility of completely...