Gravitational Self-force from Quantized Linear Metric Perturbations in Curved Space

Abstract

We present a formal derivation of the Mino-Sasaki-Tanaka-Quinn-Wald (MSTQW) equation describing the self-force on a (semi-) classical relativistic point mass moving under the influence of quantized linear metric perturbations on a curved background space-time. The curvature of the space-time implies that the dynamics of the particle and the field is history-dependent and as such requires a non-equilibrium formalism to ensure the consistent evolution of both particle and field, viz., the worldline in fluence functional and the closed- time-path (CTP) coarse-grained effective action. In the spirit of effective field theory, we regularize the formally divergent self-force by smearing the local part of the retarded Green`s function and employing a quasi- local expansion. We derive the MSTQW-Langevin equations describing the perturbations of the particle`s worldline about its semi-classical trajectory resulting from interactions with the quantum fluctuations of the linear metric perturbations. Finally, we demonstrate that the quantum fluctuations of the field could, in principle, leave imprints on gravitational waveforms expected to be observed by gravitational interferometers, thereby encoding information about tree-level perturbative quantum gravity.