pp-waves in modified gravity


Abstract: The family of metrics corresponding to the plane-fronted gravitational waves with parallel propagation, commonly referred to as the family of pp-wave metrics, is studied in the context of various modified gravitational models in a self-contained and coherent manner by using a variant of the null coframe formulation of Newman and Penrose and the exterior algebra of differential forms on pseudo-Riemannian manifolds.

Keywords: Classical general relativity, Einstein--Maxwell spacetimes, spacetimes with fluids, radiation or classical fields, wave propagation and interactions, modified theories of gravity, Chern-Simons gauge theory, exact solutions

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