what is the dimension of Black Hole?
Black hole is the densest .... in universe. We know that dimension of universe is 4D . So, what is the dimensions of black hole? Is string theory explains what is it's dimension?
Shakya I'm sorry, but this question isn't very clear. Please try to rephrase it to make it clearer. For now I would say the dimensions of a black hole are the same as the dimensions of a star, or your bedroom. And that no, string theory does not explain a black hole's dimensions.
The singularity itself is, by definition, zero dimensional (well...you could argue one dimensional as it exists over time, but it has zero spacelike dimensions).
The event horizon is a two dimensional sphere, just like the surface of a beach ball - whether it can be said to have any thickness is unknown, there might be a thickness down at the Planck scale, but that's currently unknown.
I think, knowing that what dimension a black hole has depend on approach it with it's geometry.
When we discuss about a black hole and specially it's event horizon, we encounter to some geometry to study it. We should knowing the geometry of space-time and is space-times Flat and curved, if we use the geometry of Minkowski Space-time or other geometry. the Space-time structure is very important here.
In general relativity, it's unknown that what happens in GKP and with which manifold we must mathematically discuss about it!
I think this question that what is the dimensions of black hole, is physically vague and mathematically also.
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Content dated before 7/24/2021 11:53 AM
James K 5 years ago
Not sure what you mean. In English "..." means a missing word or phrase. We don't know the Universe is 4D. Spacetime in general relativity is 4D, but that is not true in string theories. A "blackhole" is a region of spacetime. You could ask the same question of any region: "how many dimensions does your bedroom have?" Also, in English "what are the dimension of ..." means "how big is ...", though I think this is not what is meant. You should describe what research you have done, and why you think a blackhole might be different from any other region of spacetime.