Scattering by a Schwarzschild black hole of particles undergoing drag force effects

TL;DR

This paper investigates how particles scattered by a Schwarzschild black hole are affected by a viscous drag force, analyzing energy, angular momentum, and deflection angles in strong gravitational fields.

Contribution

It introduces a model for viscous drag forces acting on particles near a black hole and studies their impact on scattering dynamics in strong gravity regimes.

Findings

Drag force causes energy and angular momentum losses.

Strong field effects lead to large deflections.

Scattering angles depend on drag strength.

Abstract

The scattering of massive particles by a Schwarzschild black hole also undergoing a drag force is considered. The latter is modeled as a viscous force acting on the orbital plane, with components proportional to the associated particle 4-velocity components. The energy and angular momentum losses as well as the dependence of the hyperbolic scattering angle on the strength of the drag are investigated in situations where strong field effects cause large deflections.