A search for distinctive footprints of compact binary coalescence within alternatives theories of gravity

TL;DR

This paper reviews the polarization modes generated by binary systems in alternative gravity theories, modeling their signals to identify potential observational signatures for future gravitational wave detectors.

Contribution

It provides a framework to compare tensorial and non-tensorial polarization modes in various gravity theories without relying on the Transverse Traceless gauge.

Findings

Identification of sky locations with more intense non-tensorial modes

Comparison framework for polarization amplitudes across theories

Potential detection signatures for future interferometers

Abstract

In this review we examine the amplitude intensity associated to tensorial and non-tensorial polarization modes generated by binary systems at their inspiral stage, within the alternative theories of gravity of Brans Dicke, Rosen, and Lightman Lee. This study is performed without making an explicit use of the Transverse Traceless gauge of the General Relativity approach, and at the Newtonian limit. Consequently such additional polarization modes appear (non-tensorial) due to additional degrees of freedom in modified theories of gravitation. We model and compare the different polarization modes and strain signals for each scheme varying the sky location. Our analysis allows us to identify the locations where these modes are more intense, and, therefore susceptible to being identified for the future interferometer detector network. This gives rise to a framework in which the amplitude and the intensity of all polarization modes of general relativity and alternative hypotheses can be compared.