Universal Relations for Rotating Scalar and Vector Boson Stars

TL;DR

This paper investigates the multipolar structure of rotating bosonic stars, aiming to identify universal relations that could help distinguish these exotic objects from other compact stars in gravitational wave observations.

Contribution

It introduces the study of multipolar relations for rotating Einstein-Klein-Gordon and Proca bosonic stars using realistic potentials, seeking universal signatures.

Findings

Identification of potential universal relations for rotating bosonic stars

Methods to extract relevant observables for gravitational wave detection

Comparison between scalar and vector bosonic star structures

Abstract

Bosonic stars represent a hypothetical exotic type of compact stellar objects that could be observed from the gravitational signal of coalescing binaries in current and future gravitational wave detectors. There are two main families of bosonic stars, which depend on the nature that governs the particles that build them: Einstein-Klein-Gordon and Proca Stars. We study the multipolar structure for both families of rotating objects, using realistic potentials with the aim of finding possible universal relations and, thus, a method that allows us to distinguish between these and other compact objects in the gravitational wave paradigm. We also show how certain relevant observables can be obtained for these hypothetical but well-motivated astrophysical objects.