Gravitational wave extraction based on Cauchy-characteristic extraction and characteristic evolution

TL;DR

This paper presents a method combining Cauchy and characteristic evolution to accurately extract gravitational wave signals at null infinity from numerical simulations.

Contribution

It introduces a Cauchy-characteristic Extraction (CCE) technique that improves gravitational wave extraction accuracy in numerical relativity.

Findings

Successful implementation of CCE for gravitational wave extraction

Unambiguous detection of gravitational waves at null infinity

Enhanced accuracy over previous methods

Abstract

We implement a code to find the gravitational news at future null infinity by using data from a Cauchy code as boundary data for a characteristic code. This technique of Cauchy-characteristic Extraction (CCE) allows for the unambiguous extraction of gravitational waves from numerical simulations.