Self force on an accelerated particle

TL;DR

This paper derives a universal mode-sum regularization scheme for the self-force on accelerated particles in arbitrary spacetimes, extending previous geodesic-based results to non-geodesic trajectories.

Contribution

It introduces a regularization method for self-force calculations applicable to accelerated particles in any smooth background, generalizing prior geodesic-focused approaches.

Findings

Regularization parameters are universal for accelerated trajectories.

The method recovers known results for static scalar charges near black holes.

Explicit expressions for self-force in generic backgrounds are provided.

Abstract

We calculate the singular field of an accelerated point particle (scalar charge, electric charge or small gravitating mass) moving on an accelerated (non-geodesic) trajectory in a generic background spacetime. Using a mode-sum regularization scheme, we obtain explicit expressions for the self-force regularization parameters. In the electromagnetic and gravitational case, we use a Lorenz gauge. This work extends the work of Barack and Ori [1] who demonstrated that the regularization parameters for a point particle in geodesic motion in a Schwarzschild spacetime can be described solely by the leading and subleading terms in the mode-sum (commonly known as the $A$ and $B$ terms) and that all terms of higher order in $\ell$ vanish upon summation (later they showed the same behavior for geodesic motion in Kerr [2], [3]). We demonstrate that these properties are universal to point particles moving through any smooth spacetime along arbitrary (accelerated) trajectories. Our renormalization scheme is based on, but not identical to, the Quinn-Wald axioms. As we develop our approach, we review and extend work showing that that different definitions of the singular field used in the literature are equivalent to our approach. Because our approach does not assume geodesic motion of the perturbing particle, we are able use our mode-sum formalism to explicitly recover a well-known result: The self-force on static scalar charges near a Schwarzschild black hole vanishes.