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The lead says spacetime is a mathematical model. But we all live within spacetime, meaning spacetime can't just be a mathematical model. Spacetime is what we live in.
As far as we know, spacetime is a four dimensional thing that generally has everything in it, except for the stuff that is very far away, or very old, or through black holes or across other exotic boundaries.
I think the lead should be updated. 96.227.223.203 ( talk) 03:13, 5 September 2023 (UTC)
I don't think this terminology is helpful. Can we improve the description of a euclidean geometry please? Thx :) 189.158.98.184 ( talk) 14:26, 11 November 2023 (UTC)
The derivation of the longitudinal Doppler effect is unclear. Either clarify the reasoning, or copy the reasoning from the Wikipedia page "Relativistic Doppler effect". Also: The equation "W = YW' " should most probably be "w = gamma * w' ".
If the current example could be clarified, then that would be a good thing: We would have two different derivations of the longitudinal relativistic Doppler effect. Note that the explanation in the referenced book by Sander Bais, is much clearer. Johanwiden ( talk) 08:43, 17 March 2024 (UTC)
As stated in Wikipedia "Four-momentum", and in the referenced paper by Sander Bais, the vertical axis has units "kg * m / s", but in the section it is implied that the unit is "m" (i.e. c * t). The explanation therefore becomes unclear. An explanation of the units of the axes is also needed: Why they have those units, and why it is OK for relativistic calculations. Johanwiden ( talk) 12:09, 17 March 2024 (UTC)
A few days ago, I undid a good faith edit by @ OzzyOlly: with the explanation,
"Science articles need to start with general readability topics, leaving technical material for later. However, the topics covered in this section, although special relativity topics, are quite technical, presenting a dilemma: placement before and after the general relativity section are *both* problematical. Hence the warning."
Thinking it over, OzzyOlly did have a point. No matter where in Spacetime you place the "Beyond the basics" section, it appears a bit misplaced. On the other hand, I think that this section naturally fits in Special relativity after the "Dynamics" section. Any thoughts on this? If there are no objections after a week, I will make the move. Prokaryotic Caspase Homolog ( talk) 14:29, 26 June 2024 (UTC)
I moved the "Beyond the basics" section to Special relativity. My figure numbering in that article is now rather messed up. I'll fix the numbering later. Prokaryotic Caspase Homolog ( talk) 08:36, 4 July 2024 (UTC)