Rotating Boson Stars and Q-Balls II: Negative Parity and Ergoregions

TL;DR

This paper constructs and analyzes rotating boson stars with positive and negative parity, exploring their properties, frequency dependence, and ergoregion presence, extending understanding of these exotic gravitational objects.

Contribution

It introduces axially symmetric rotating boson stars with negative parity and examines their ergoregions and frequency-dependent properties, advancing the study of boson star solutions.

Findings

Boson stars exhibit a spiral-like frequency dependence of mass and charge.

Presence of ergoregions depends on specific parameters of the solutions.

Negative parity solutions extend the known configurations of rotating boson stars.

Abstract

We construct axially symmetric, rotating boson stars with positive and negative parity. Their flat space limits represent spinning Q-balls. $Q$-balls and boson stars exist only in a limited frequency range. The coupling to gravity gives rise to a spiral-like frequency dependence of the mass and charge of boson stars. We analyze the properties of these solutions. In particular, we discuss the presence of ergoregions in boson stars, and determine their domains of existence.