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> I have always had trouble reconciling the "tidal stresses rip everything apart" with the idea that "everything hits the center in finite time, thus infinite d

> I have always had trouble reconciling the "tidal stresses rip everything apart" with the idea that "everything hits the center in finite time, thus infinite density and singularity". From whose perspective? Two astronauts, a watcher and a faller, have two very different experiences. > Do the photons nearer the center pull away from the photons further out? I believe their wavelengths increase toward infinity. They don't move more quickly away from one another but, rather, become red shifted. But I'm just a layman so my guess is as good as yours.

lordfrito 3y ago
> From whose perspective? Two astronauts, a watcher and a faller, have two very different experiences. Right, that's sort of my point. If the experiences differ outside the event horizon, they must differ even more inside the horizon. Imagine Astronaut "A" who is closer to the horizon gets pulled in first, and is accelerating faster than Astronaut "B" outside the horizon. Once A is inside the horizon, B can never interact with A again. I would assume this is true even after B crosses the horizon later on -- they both accelerate but tidal forces keep them moving further and further apart. Even though both are inside the horizon and heading in the same direction (center), at no point do they ever slow down or "catch up" to each other. B still can't interact with A, as A was infinitely redshifted already. Would seem they're always cutoff from each other. > I believe their wavelengths increase toward infinity. They don't move more quickly away from one another but, rather, become red shifted. Red shifted from the point of an observer looking towards the center of the black hole (anyone looking away from the center sees the outside universe blue shifted). Red shifted light from far away stars implies an expanding universe. Wouldn't red shifted light looking at the center of a black hole imply that the space between the observer and the center of the hole be increasing as well?? So increasing wavelength = increasing curvature = space expansion? I guess my naïve interpretation is that, while you can never get out of the black hole (you can't outrun the pull towards the center), at the same time you can never hit the center as things closer to it get further and further away from you. Would seem to me that there is expansion of space inside a black hole, maybe it's this that prevents a true singularity from forming?
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lordfrito 3y ago

> From whose perspective? Two astronauts, a watcher and a faller, have two very different experiences. Right, that's sort of my point. If the experiences differ outside the event horizon, they must differ even more inside the horizon. Imagine Astronaut "A" who is closer to the horizon gets pulled in first, and is accelerating faster than Astronaut "B" outside the horizon. Once A is inside the horizon, B can never interact with A again. I would assume this is true even after B crosses the horizon later on -- they both accelerate but tidal forces keep them moving further and further apart. Even though both are inside the horizon and heading in the same direction (center), at no point do they ever slow down or "catch up" to each other. B still can't interact with A, as A was infinitely redshifted already. Would seem they're always cutoff from each other. > I believe their wavelengths increase toward infinity. They don't move more quickly away from one another but, rather, become red shifted. Red shifted from the point of an observer looking towards the center of the black hole (anyone looking away from the center sees the outside universe blue shifted). Red shifted light from far away stars implies an expanding universe. Wouldn't red shifted light looking at the center of a black hole imply that the space between the observer and the center of the hole be increasing as well?? So increasing wavelength = increasing curvature = space expansion? I guess my naïve interpretation is that, while you can never get out of the black hole (you can't outrun the pull towards the center), at the same time you can never hit the center as things closer to it get further and further away from you. Would seem to me that there is expansion of space inside a black hole, maybe it's this that prevents a true singularity from forming?

deleted 3y ago
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