Dynamic transition to spontaneous scalarization in boson stars

TL;DR

This paper demonstrates that spontaneous scalarization, previously observed in neutron stars, also occurs in boson stars without self-interaction, using a 3+1 decomposition in the Jordan frame.

Contribution

It shows for the first time that spontaneous scalarization occurs in boson stars without self-interaction, challenging previous claims.

Findings

Spontaneous scalarization occurs in boson stars without self-interaction.

Analysis performed in the Jordan frame with spherical symmetry.

Results extend scalar-tensor gravity phenomena to boson star models.

Abstract

We show that the phenomenon of spontaneous scalarization predicted in neutron stars within the framework of scalar-tensor tensor theories of gravity, also takes place in boson stars without including a self-interaction term for the boson field (other than the mass term), contrary to what was claimed before. The analysis is performed in the physical (Jordan) frame and is based on a 3+1 decomposition of spacetime assuming spherical symmetry.