New answers tagged singularities
0
votes
Why aren't all black holes the same "size"?
In my view
Conclusions from a Classical theory of gravity(general relativity) should not be made because at such a condition curvature is divergent and one should seek for a quantum theory of gravity ...
- 368
0
votes
Why aren't all black holes the same "size"?
The size of a black hole is usually taken to be its event horizon and its radius is called the Schwarzschild radius. It is determined by the mass of the black hole.
Whilst GR predicts a singularity at ...
- 13.4k
0
votes
Why aren't all black holes the same "size"?
There is no good answer to this question yet, especially because none of the theories concerning black hole size differences take into account the evidence we have have collected, such as accretion ...
- 1
0
votes
Pole at Infinity of a 1-loop scalar bubble diagram
You have to think about it as having to deform your integration contour to avoid the roots $\alpha_\pm$. When you move along the real $s$ axis, the roots move as follows (the arrows indicate ...
- 382
1
vote
Why pole mass is physical mass?
A sketch of the proof for an interacting (hermitean) scalar theory goes as follows: Consider the two-point function $$\langle 0 | {\rm T} \phi(x) \phi(0) |0\rangle=\theta(x^0)\langle0|\phi(x) \phi(0)|...
- 7,298
0
votes
Is the size of a black hole singularity smaller than a fundamental particle?
The singularity is a point. Literally, according to current scientific consensus it is the 0 dimensional object my fourth grade teacher tried to explain by making a dot on the overhead projector… Mass ...
3
votes
Accepted
Reissner-Nordström black holes and naked singularities
The Schwarzschild metric is
$$c^2\mathrm{d}\tau^2=k_Sc^2 \mathrm{d} t^2-k_S^{-1} \mathrm{d} r^2-\mathrm{d} \Omega^2$$
for the metric on a sphere $\mathrm{d}\Omega$ and the “Schwarzschild factor” $k_S=...
- 3,347
1
vote
Does the fact that the general theory of relativity predicts singularities imply that it's wrong?
Isaac Asimov's The Relativity of Wrong is highly relevant to this question.
If you live in an absolute world where a theory is either right or wrong, and anything that isn't completely right is wrong, ...
- 22.1k
1
vote
Does the fact that the general theory of relativity predicts singularities imply that it's wrong?
All models are wrong, but some are useful
George Box
We already expect that General Relativity is "wrong" in the sense that it does not have unlimited applicability. That does not prevent ...
- 136k
1
vote
Accepted
Virtual soft photons Weinberg volume I chapter 13.2
The soft virtual photons inside the diagram do not contribute to the $\frac{1}{q^0}$ pole. The reason is that the pole comes by considering a new contribution that looks like (using the $-+++$ ...
- 23k
Top 50 recent answers are included