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Spacetime perturbations and quasi-teleparallel gravity
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Gravity is identical to curved spacetime. It is manifested by the curvature of a Riemannian spacetime in general relativity but by torsion or non-metricity in teleparallel gravity models. In this paper, we apply these multiple options to the spacetime perturbation theory and seek the possibilities of representing the gravitation of the background and that of the perturbation in separate ways. We show that the perturbation around a Riemannian background can be described by torsion or non-metricity, so that we have teleparallel like actions for the perturbation.
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Correlated parity violation in gravity and electromagnetism from five-dimensional spacetime
A five-dimensional teleparallel Kaluza-Klein action produces a single parameter-free prediction: the electromagnetic helicity dispersion shift is exactly six times the gravitational one.
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