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A Note on the Feynman Lectures on Gravitation
Satoshi Nakajima
https://arxiv.org/abs/2509.11799 https://arxiv.org/pdf/2509.11799

A Note on the Feynman Lectures on Gravitation
Following Feynman's lectures on gravitation, we consider the theory of the gravitational (massless spin-2) field in flat spacetime and present the third- and fourth-order Lagrangian densities for the gravitational field. In particular, we present detailed calculations for the third-order Lagrangian density.