# On-axis scattering of scalar fields by charged rotating black holes

## TL;DR

This paper studies how massless scalar fields scatter off charged rotating black holes, using numerical methods and comparing results with classical and semiclassical theories to understand the scattering behavior.

## Contribution

It provides new numerical analysis of on-axis scalar field scattering by Kerr-Newman black holes and validates results against classical and semiclassical approximations.

## Key findings

- Numerical scattering cross sections match analytical predictions.
- Excellent agreement between numerical and classical/semiclassical results.
- Results vary with different black hole parameters.

## Abstract

We investigate the scattering of a massless scalar field by a Kerr-Newman black hole, considering the case of on-axis incidence. We use the partial wave method to find numerical results for the scattering cross section, which we compare with classical and semiclassical analytical results, obtaining excellent agreement. We present a selection of plots for different values of the black hole parameters.