Work

Two types of boson stars in the ( 3 + 1 )-dimensional O ( 3 ) sigma-model

Year: 2025

Type: article

Abstract: We investigate boson stars in an O ( 3 ) scalar field theory with a symmetry-breaking potential. By constructing numerically spherically symmetric solutions, we demonstrate that the model gives rise to a rich set of field configurations. The negative coupling constant of the scalar self-interactions allows for two types of boson stars: type I solutions represent the usual boson stars, which emerge from the vacuum as the boson frequency is decreased below the boson mass, whereas type II boson stars emerge from a set of static soliton solutions. Depending on the strength of the gravitational coupling constant, both types, or only one type, are present. At a critical set of coupling constants, both types undergo a bifurcation. There the spirals of both types disconnect from their branches and reconnect with each other, while the remaining branches of both types also reconnect with each other. Analogous features are seen for U(1)-gauged boson stars.

Source: Physical review. D/Physical review. D.

DOI: 10.1103/8qwg-f9wz

Authors: Jutta Kunz, Aliaksei Mikhaliuk, Yakov Shnir

Institutions: Carl von Ossietzky Universität Oldenburg, Belarusian State University, Joint Institute for Nuclear Research

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Funder: Fundação de Amparo à Pesquisa do Estado de São Paulo

Award: Gravitating U(1) gauged Skyrmions and hairy black holes