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WittyUnwittingly OP t1_j29tbcy wrote

Reply to comment by phantagom in What is our current "best guess" about how to observers that entered a black hole on opposite sides would look to each other once they crossed the event horizon? by WittyUnwittingly

Sorry. I did not mean to imply that blueshifted light observed from within an event horizon is what most mainstream scientists mean when they say "loss of causality information"

I understand that debate relatively well, and it pertains to recovery of information about what fell into the black hole from the outside.

I'm asking: is there something fundamental that I'm overlooking with my description of the "infinitely blueshifted" light? Seems to me that from the inside of a black hole you would be unable to deduce anything about the order of events outside using the photons falling in, because from your perspective, they would be arriving all at the same time.

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phantagom t1_j2a17xx wrote

It is true that from the perspective of an observer inside the event horizon of a black hole, the photons falling into the black hole would appear to be infinitely blueshifted and would arrive at the singularity at the center of the black hole all at the same time. This is a consequence of the extreme gravitational forces present in the region, which cause the photons to be blueshifted and to follow highly curved paths as they fall towards the singularity.
However, from the perspective of an observer outside the event horizon, the photons falling into the black hole would not be infinitely blueshifted, and would not all arrive at the same time. From this perspective, the photons would follow paths that are determined by the curvature of spacetime, which would generally not be straight lines.

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