Talk:General relativity - Misplaced Pages

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Books

Shall we create a separate page for the notable books on general relativity at various levels? This article is already long in its current state. We do have pages for lists of textbooks in classical mechanics and quantum mechanics, of thermodynamics and statistical mechanics, and in electromagnetism. Nerd271 (talk) 00:37, 14 June 2020 (UTC)

4D Spacetime: 3D Regular Space + 1D Time

Einstein recognized the 4 dimensions of spacetime: 3D regular space + 1D time. 2601:589:4800:9090:489:97E6:2CC8:D11E (talk) 13:01, 21 August 2020 (UTC)

Possible incorrect equation?

Under "Total force in general relativity":

Applying $F(r)=-{\frac {\partial U}{\partial r}}$ to the given formula for potential energy gives ${\frac {GMm}{r^{2}}}-{\frac {L^{2}}{mr^{3}}}+{\frac {3GML^{2}}{mc^{2}r^{4}}}$ . Is the force equation currently in the article incorrect? TeX seems reluctant to parse minus signs... — Preceding unsigned comment added by Compoteleon (talk • contribs) 12:57, 14 January 2021 (UTC)

Please sign all your talk page messages with four tildes (~~~~) — See Help:Using talk pages. Thanks.

@Compoteleon: There currently is a problem with rendering minus signs in Chrome and Edge. Firefox is doing fine. See Talk:Fourier transform#Maybe a mistake in time shift property? - DVdm (talk) 14:45, 14 January 2021 (UTC)

Unclear sentence

The intended structure of the following sentence is unclear to me: “Reconciliation of general relativity with the laws of quantum physics remains a problem however, as there is a lack of a self-consistent theory of quantum gravity; and how gravity can be unified with the three non-gravitational forces—strong, weak, and electromagnetic forces.”

A minor issue is that a comma seems necessary before “however.” A more important issue is how the part after the semicolon is related to what comes before. Would the following rewrite be correct? Or would something else be better?

“Reconciliation of general relativity with the laws of quantum physics remains a problem, however, as there is a lack of a self-consistent theory of quantum gravity, and how gravity can be unified with the three non-gravitational forces—strong, weak, and electromagnetic forces—is not yet known.”

Tom Gally (talk) 13:27, 16 June 2022 (UTC)

Your suggested change would be an improvement. However, I personally would not want to suggest that gravity theory must change to accommodate those other theories. Perhaps they need to change instead. Or perhaps our four-dimensional space-time continuum should be embedded in a higher dimensional space with a more uniform structure, like Minkowski space? JRSpriggs (talk) 15:09, 16 June 2022 (UTC)

Thank you for the reply. I am afraid I don’t understand the issues well enough to feel confident about making any changes to the article (other than adding a comma before "however"). Can you, or someone else, use my suggestion above as a basis for fixing the structure of that sentence? As it is, it doesn’t make sense grammatically. Tom Gally (talk) 06:38, 18 June 2022 (UTC)

To me, the major issue is the forced mashing together of multiple sentences into a single sentence via the semicolon. How about this? “Reconciliation of general relativity with the laws of quantum physics remains a problem, however, as there is a lack of a self-consistent theory of quantum gravity. It not yet known how gravity can be unified with the three non-gravitational forces—strong, weak, and electromagnetic forces.” Prokaryotic Caspase Homolog (talk) 06:39, 19 June 2022 (UTC)

I like this, so I'll 'be bold' and put it in. David Spector (talk) 00:01, 24 June 2022 (UTC)

Many thanks to all of you for your replies and for fixing that sentence! I’ll try to be bolder next time. Tom Gally (talk) 12:19, 25 June 2022 (UTC)

"The relativistic effect"

In section Total force in general relativity, the two-body forces generated by GR are listed as Newton's force of gravity, centrifugal force, and the relativistic effect. What does "the relativistic effect" mean? Does it refer to SR or GR? What is it intuitively? Is it what happens in the gravitational lensing of galaxies? Was it described in previous sections? Could the wording be improved? David Spector (talk) 23:58, 23 June 2022 (UTC)

See Two-body problem in general relativity#Effective radial potential energy. According to that article, it is a GR effect. For particles traveling at the speed of light, it doubles the Newtonian bending. So it explains half of the lensing. JRSpriggs (talk) 05:24, 24 June 2022 (UTC)

A generalization of the Einstein-Maxwell equations

I think the solutions I have obtained will be of interest to the readers of this wikipedia article. Since I am the author, I cannot make any related edits. The article has been published open access CC BY 4.0. Cotton, F.W. A generalization of the Einstein–Maxwell equations. Eur. Phys. J. Plus 136, 162 (2021).

     https://doi.org/10.1140/epjp/s13360-021-01115-6 71.183.235.5 (talk) 19:32, 30 July 2022 (UTC)

Thanks for sharing. So far Google Scholar only produces this. When this is noticed, picked up and sufficiently cited in the relevant literature, it could be ready for being mentioned in Misplaced Pages. - DVdm (talk) 20:32, 30 July 2022 (UTC)

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