# Questions tagged [singularities]

Use this tag for questions about singularities in physical quantities, i.e. cases where a quantity becomes or appears to become infinite or ill-defined. Consider the more specific tags [black-holes] and [wormholes] for certain kinds of singularities occurring in general relativity. For the procedure of "getting rid" of singularities, consider the [regularization] tag.

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### Is it possible for a meter to orbit the singularity of a black hall behind the event horizon?

After a matter enters the event horizon of a black hall, is it possible for it to orbit the point of singularity without merging with it? Obviously, it is not something we can observe, so my question ...
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### Why is Kerr Singularity ring shaped?

Why is the Kerr singularity like a ring — not a 3-D ellipsoid, or a point, or even a flattened disk? I need an intuitive answer, please.
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### Is my understanding of Penrose's singularity theorem correct?

My understanding of Penrose's singularity theorem and the background to it is as follows: After it was proven that the singularity at the event horizon of a black hole was a coordinate artifact, ...
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### Penrose singularity theorem

I'm trying to understand this theorem and his proof , I think I understand the theorem! But I have some difficulties with the second part of the proof (when we would like to prove that B$^3$ is not ...
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### Do "tadpole diagram with two external legs" always vanish in massless theories?

What I think the physics community means when talking about tadpole diagrams is something like this: and I don't understand why these diagrams always cancel (or why they don't for the Higgs boson) ...
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### What is the physical origin of UV divergences?

I've heard of UV divergences appearing in perturbative calculations as both a mathematical artifact and as having a physical origin (the latter understanding due to Wilson). Could one clarify what ...
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### Computing curvature singularities from a metric

Suppose I have the metric $$ds^2 = f(r)(dt^2-dr^2-dz^2) - \frac{1}{f(r)} d\phi^2.$$ How would you calculate the curvature singularities of this metric if we assume that $f(r)$ takes value $0$ for \$...
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### A naïve question about spacetime singularities

Very little that I know about general relativity is that there are solutions of its equations with singularities, and these are interpreted as black holes. Mathematically, the most widespread kind of ...
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### Why does General Relativity predict that singularities are infinitely dense?

From my understanding of general relativity, energy curves spacetime to produce an effect that we call gravity. The greater the concentration of energy, the greater the curvature and hence the greater ...
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### Cosmic censorship conjecture: Why naked singularities are expected not to exist?

According to wikipedia, the weak form of the Cosmic Censorship Hypothesis says the following: Singularities [...] are typically hidden within event horizons, and therefore cannot be observed from the ...
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### Do black holes rip apart even atoms and protons and neutrons?

I am aware that black holes rip apart objects because of spaghettification. What about atoms and protons and neutrons? Do they get ripped apart too? But, in the case of protons and neutrons, wouldn't ...