Curvature-based gauge-invariant perturbation theory for gravity: A new paradigm
Curvature-based gauge-invariant perturbation theory for gravity: A new paradigm
A new approach to gravitational gauge-invariant perturbation theory begins from the fourth-order Einstein-Ricci system, a hyperbolic formulation of gravity for arbitrary lapse and shift whose centerpiece is a wave equation for curvature. In the Minkowski and Schwarzschild backgrounds, an intertwining operator procedure is used to separate physical gauge-invariant curvature perturbations …