Induced scalarization in boson stars and scalar gravitational radiation

TL;DR

This paper investigates how boson stars evolve in scalar-tensor gravity theories, highlighting spontaneous and induced scalarization phenomena and their associated scalar radiation emissions, and introduces new stable boson star configurations.

Contribution

It demonstrates the process of scalarization in boson stars within scalar-tensor theories and presents new stable configurations in this context.

Findings

Strong scalar radiation emission during scalarization

Existence of new stable boson star configurations in scalar-tensor theories

Scalarization occurs from initial data on the general relativity S-branch

Abstract

The dynamical evolution of boson stars in scalar-tensor theories of gravity is considered in the physical (Jordan) frame. We focus on the study of spontaneous and induced scalarization, for which we take as initial data configurations on the well-known S-branch of a single boson star in general relativity. We show that during the scalarization process a strong emission of scalar radiation occurs. The new stable configurations (S-branch) of a single boson star within a particular scalar-tensor theory are also presented.