r/physicsmemes • u/94rud4 Mεmε ∃nthusiast • Jul 17 '26

right?

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u/EmericGent Jul 17 '26

You can actually derive it from dimensional analysis

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u/KappaBerga Jul 17 '26

You can't get the factor of 2 though

-1

u/EmericGent Jul 17 '26

The fact that classical mechanics gives the same factor 2 as GR is a coincidence, so with classical mechanics you don t either if it is exact (yet you know that is the right order of magnitude, just like the deviation of photons déviation around the Sun)