Timeline for How can Cooper fall into a black hole from the perspective of Dr. Brand or anyone on Earth?
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5 events
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| Mar 14, 2015 at 13:58 | comment | added | Hypnosifl | If there is something like a light ray remaining permanently on the horizon, so it can act as a "marker", then the falling observer does in fact see himself pass the marker in finite proper time. The fact that a falling observer crosses the absolute horizon in finite proper time is a standard result in general relativity--are you claiming otherwise, or are you saying you think there is a flaw in GR itself? I didn't see anything on your blog link above which really explained why you think the falling observer never experiences crossing the horizon. | |
| Mar 14, 2015 at 13:44 | comment | added | Jim2B | I agree. As you fall towards the Event Horizon, there is always a region below you from which light can reach you - even after you have fallen through the absolute Horizon. But an outside observer never sees the faller enter the absolute Horizon and the faller sets a marker at the Horizon, he also never sees himself pass that marker (this is contrary to several popular science books - see my blog on it). | |
| Mar 14, 2015 at 4:07 | comment | added | Hypnosifl | As I said though, if you drop some kind of portal like a wormhole towards a black hole, it shifts the absolute horizon so that any escape you make must have been above that horizon, but there is still an apparent horizon that has all the observable features of an event horizon. The absolute horizon isn't really measurable at any given moment--it's defined "teleologically" as the boundary between the region where light can eventually escape and where it can't, which means the position of the absolute horizon at any given moment can depend on what happens to the BH in the future. | |
| Mar 14, 2015 at 1:08 | history | edited | Jim2B | CC BY-SA 3.0 |
added 4 characters in body
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| Mar 13, 2015 at 23:38 | history | answered | Jim2B | CC BY-SA 3.0 |