New Solutions for Rotating Boson Stars

TL;DR

This paper introduces two new classes of rotating boson star solutions with small angular momentum, expanding understanding of their configurations through numerical and analytical methods.

Contribution

It presents novel solutions for rotating boson stars with small angular momentum, including configurations with all particles in a rotating state and mixed ground/excited states.

Findings

Identified two new classes of rotating boson star solutions.

Derived analytical series expansions for these configurations.

Numerically validated the solutions using the Gross-Pitaevskii-Poisson equations.

Abstract

It has been shown that scalar fields can form gravitationally bound compact objects called boson stars. In this study, we analyze boson star configurations where the scalar fields contain a small amount of angular momentum and find two new classes of solutions. In the first case all particles are in the same slowly rotating state and in the second case the majority of particles are in the non-rotating ground state and a small number of particles are in an excited rotating state. In both cases, we solve the underlying Gross-Pitaevskii-Poisson equations that describe the profile of these compact objects both numerically as well as analytically through series expansions.