[GR lecture 20/06/2022] 21: not only one theory of gravity

NOTE: at the board I just sketched the lagrangian densities for theory (2) and (3) to just show how do they roughly look line as compared to the Hilbert action. The idea is just to show you that you can have theories with more degrees of freedom that also "contain" GR and why they are used.
- Lovelock's theorem
- f(R) theories
- torsion
- Non-metricity

Видео [GR lecture 20/06/2022] 21: not only one theory of gravity канала Lectures in Physics