Gravitational memory of boson stars

TL;DR

This paper explores how boson stars in scalar-tensor gravity theories can retain a 'memory' of the gravitational constant's past values, affecting their evolution and properties.

Contribution

It introduces boson star solutions in scalar-tensor theories and analyzes their dependence on the gravitational constant's asymptotic value, highlighting a new form of gravitational memory.

Findings

Boson stars' properties depend on the initial gravitational constant.

The concept of gravitational memory extends to boson stars in scalar-tensor theories.

Implications for gravitational stellar evolution are discussed.

Abstract

`Gravitational memory' refers to the possibility that, in cosmologies with a time-varying gravitational `constant', objects such as black holes may retain a memory of conditions at the time of their birth. We consider this phenomenon in a different physical scenario, where the objects under consideration are boson stars. We construct boson star solutions in scalar-tensor gravity theories, and consider their dependence on the asymptotic value of the gravitational strength. We then discuss several possible physical interpretations, including the concept of pure gravitational stellar evolution.