Orbital Dynamics of Binary Boson Star Systems

TL;DR

This paper investigates the orbital dynamics and gravitational wave emissions of binary boson star systems, highlighting the influence of internal phase differences and comparing their signals to black hole binaries.

Contribution

It extends previous work by analyzing orbiting binary boson stars, focusing on phase effects and gravitational wave outputs, which are less understood in such systems.

Findings

Early-time behavior is relatively simple.

Late-time dynamics vary significantly with initial phase configurations.

Gravitational wave signatures differ from black hole binaries.

Abstract

We extend our previous studies of head-on collisions of boson stars by considering orbiting binary boson stars. We concentrate on equal mass binaries and study the dynamical behavior of boson/boson and boson/antiboson pairs. We examine the gravitational wave output of these binaries and compare with other compact binaries. Such a comparison lets us probe the apparent simplicity observed in gravitational waves produced by black hole binary systems. In our system of interest however, there is an additional internal freedom which plays a significant role in the system's dynamics, namely the phase of each star. Our evolutions show rather simple behavior at early times, but large differences occur at late times for the various initial configurations.