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Results tagged with black-holes
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user 305659
A black hole is a region of spacetime from which nothing can escape. More formally, the future light cone of any observer within the black hole is completely contained in the black hole, and the black hole region is not within the past light cone of any observer that goes to spatial infinity in an infinite amount of time.
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Is the entropy of a black hole relative?
I have a question about the entropy of black holes. Well, some time ago I was able to demonstrate theoretically that the entropy of black holes should be relative, that is, depend on the observer.
But …
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Same Mass But Less Gravitational Effect Due To Electric Charge?
The Schwarzschild metric describes a spherical, eternal, static black hole with no rotation and no electrical charge, so it can be used to understand gravity around objects with negligible rotations ( …
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answer
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Derivation of Proper Time of Fall in Schwarzschild Metric
Some time ago, in this question (Proper Time of Fall in Schwarschild Metric), I asked how to find the proper time of fall of an observer in the Schwarzschild metric because I had found many different …
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Proper Time of Fall in Schwarschild Metric
I've been trying to understand how the proper time of a radial fall into a black hole is finite, but I'm confused because I found many results and they do not seem to be the same.
Usually what I see i …
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Do Electrically Neutral Black Holes Interact With a Charge's Electromagnetic Field?
I've been wondering if it's possible for a black hole to interfere with the electromagnetic field of an electric charge, without the black hole itself having an electric charge.
Imagine that there is …