All Questions
Tagged with black-holes singularities
462
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If it's a common myth that a black hole contains a singularity, what does a black hole actually (likely) contain?
It's a common myth (especially in popsci) that a black hole contains a singularity. However, I cannot find an explanation for what we think a black hole actually does contain. The best I've seen is &...
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3
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Equivalence principle near a black hole
At every spacetime point, there is a locally inertial frame in which the effect of gravitation is absent. Can this point be taken near the center of a black hole?
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1
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183
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Why can't the answers to equations be infinity?
When talking about black holes and singularities, most books say that combining relativity and quantum mechanics gives the answer of infinity in some equations. They also say that:
Infinity is the ...
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4
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What does it mean for the laws of physics to "break down" at a singularity? [duplicate]
When the statement says:
As you get to the center of a singularity the laws of physics "break down".
What exactly does that mean?
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1
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How can the distance to the event horizon, as measured by a tape attached to a falling mass, be reconciled with the mass passing through it?
When hovering 2km. above the horizon of a black hole with a mass of the sun, at r=5km., the distance you measure with a measuring tape attached to a mass you throw in the hole will tell you the ...
- 450
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104
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How far does a particle fall before it hits the singularity of a black hole?
Even though a black hole has a Scwarzschild radius that indicates a finite small distance to the center of the hole, the distance traveled by an infalling particle seems a lot bigger than the ...
- 450
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1
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Can the inertia factor of a black hole be used to infer its density profile?
The Sun's inertia factor of ~0.07 suggests a stark contrast between the density of its outer shells (very low density) and its core (very dense). The same applies to the rest of the solar system. ...
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3
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Hypothetically, could the interior of a black hole look exactly like the universe that surrounds us?
I do understand that we can't experimentally verify anything we imagine about the interior of a black hole.
If we were to apply what we know about the physics of the observable universe and assume ...
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2
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266
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How can we be sure that black hole's singularity is not a missunderstanding? [duplicate]
The Newtonian gravitational potential is given by:
$$\phi=-\dfrac{GM}{r}$$
Which appears in the Schwarzschild metric tensor with a so-called singularity at $r=0$. Nonetheless, I can't get why is it ...
- 495
2
votes
1
answer
125
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Could a high energy content prevent a singularity inside a black hole?
Very roughly, dark energy tends to cause space to expand and mass tends to cause space to contract. If nothing gets in the way, the math on that contraction breaks down when it forms a black hole ...
- 1,269
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How can there be a naked singularity in the Reissner-Nordström (RN) geometry? [duplicate]
I recently read that, if the mass of a charged black hole is small (compared to its squared charge times some constant), than there is no event horizon, but there is still a (naked) singularity. My ...
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3
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Is there any remote possibility that a singularity may be real? [closed]
Usually, when physicists talk about singularities in Einstein's theory of relativity, they say that these cannot exist and that they are only mathematical artifacts that indicate that is likey that ...
- 2,462
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2
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1k
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Schwarzschild metric with negative mass
Can mass be negative in Schwarzschild metric? If we use $M<0$, will it still be a solution to EFE? If not, why?
- 1,161
4
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2
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316
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Is $\theta=0$ a coordinate singularity in the Schwarzschild metric?
We often hear this example of coordinate singularity. We can describe the 3D Euclidean space using rectangular or spherical coordinates. But in the spherical coordinate, the north pole $(r,\theta=0, \...
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6
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Do black holes have a size?
I'm wondering if one can say that a black hole is an object "made of matter" that has a size (as a size, I'm not talking about the size of the event horizon).
I would like to know if one can ...
- 195