# Intensification of Gravitational Wave Field Near Compact Star

## TL;DR

This paper investigates how gravitational waves are lensed by compact stars, revealing that such lensing produces spherical aberration and depends on the star's mass and radius, offering new insights into wave behavior near dense objects.

## Contribution

The study models the internal structure of compact stars and demonstrates the unique lensing effects on gravitational waves, including spherical aberration, using numerical simulations.

## Key findings

- Gravitational waves are lensed by compact stars similarly to optical lensing.
- Lensing effects depend significantly on the star's mass and radius.
- Inside and outside the star respond differently to incoming gravitational waves.

## Abstract

The gravitational waves (GWs) has been a topic of interest for its versatile capabilities of probing several aspects of cosmology and early Universe. Gravitational lensing enhances further the extent of this sort of waves and upgrade our understanding to a next level. Besides several similarities with optical waves, GWs are capable of passing through optically opaque celestial objects like stars, exoplanets unlike light waves and manifest a different kind of lensing effect. In this work we have explored the lensing action of compact objects on gravitational waves using numerical means. After modeling the internal mass distribution of the compact objects by TOV equations and tracing wavefronts using geodesic equations, we have found that the GWs are indeed lensed in a manner analogous to the optical lensing of light in presence of a thick optical lens by producing spherical aberration in the focused waves. The distance to the best focused point shows significant dependence with the mass and radius of the lensing star and unlike gravitational lensing, the region inside and outside compact objects responds differently to the incoming waves.