# Gravitational lensing around Kehagias-Sfetsos compact objects surrounded by plasma

## TL;DR

This paper explores how plasma and the Hořava parameter influence the optical properties and gravitational lensing effects of Kehagias-Sfetsos compact objects, highlighting their impact on the shadow and light deflection.

## Contribution

It provides a detailed analysis of plasma effects on the shadow and lensing around KS objects, incorporating the influence of the Hořava parameter, which is a novel aspect.

## Key findings

- Both plasma and Hořava parameter significantly affect the shadow size.
- Deflection angle strongly depends on plasma density and Hořava parameter.
- Magnification varies with plasma distribution and gravitational lensing strength.

## Abstract

We study the optical properties of the Kehagias-Sfetsos (KS) compact objects, characterized by the "Ho\v{r}ava" parameter $\omega_{_{KS}}$, in the presence of plasma, considering its homogeneous or power-law density distribution. The strong effects of both "Ho\v{r}ava" parameter $\omega_{_{KS}}$ and plasma on the shadow cast by the KS compact objects are demonstrated. Using the weak field approximation, we investigate the gravitational lensing effect. Strong dependence of the deflection angle of the light on both the "Ho\v{r}ava" and plasma parameter is explicitly shown. The magnification of image source due to the weak gravitational lensing is given for both the homogeneous and inhomogeneous plasma.