Scalar radiation from Chameleon-shielded regions

TL;DR

This paper investigates how a pulsating mass influences the Chameleon scalar field, revealing that such dynamics generate scalar radiation and cause the external metric to become time-dependent, with implications for testing modified gravity theories.

Contribution

It introduces the analysis of scalar radiation from a pulsating mass within a Chameleon field exhibiting a thin-shell, highlighting new dynamical effects in such models.

Findings

Pulsations induce time-dependent Chameleon fields.

Scalar radiation is emitted from the pulsating region.

The external metric becomes non-static due to the pulsations.

Abstract

I study the profile of the Chameleon field around a radially pulsating mass. Focusing on the case in which the background (static) Chameleon profile exhibits a thin-shell, I add small perturbations to the source in the form of time-dependent radial pulsations. It is found that the Chameleon field inherits a time-dependence, there is a resultant scalar radiation from the region of the source and the metric outside the spherically symmetric mass is not static. This has several interesting and potentially testable consequences.