Lagrangians for non-relativistic gravity
arXiv:2112.12648 · doi:10.1103/PhysRevD.105.064051
Abstract
We study the covariant expansion of Einstein-Hilbert action in powers of with arbitrary spacetime foliation where is the speed of light. This is done firstly by suitable parametrization of geometry which is called 'pre-non-relativistic' parametrization. This allows us to rewrite the general relativity in a form suitable for the analytical expansion. Consequently, we can study the expansion of Einstein-Hilbert action up to the next-to-next-to-leading order.