Global monopoles in the Brans-Dicke theory

TL;DR

This paper investigates the gravitational effects of global monopoles within the Brans-Dicke theory, revealing that the angular deficit depends on scalar field asymptotics and the Brans-Dicke parameter, leading to a repulsive gravitational field outside the monopole core.

Contribution

It introduces the dependence of the angular deficit on scalar field and Brans-Dicke parameter, a novel feature in the study of monopoles in scalar-tensor gravity.

Findings

Global monopoles produce a repulsive gravitational field outside the core.

The angular deficit depends on _{} and , \

The scalar field influences the gravitational properties of monopoles.

Abstract

A gravitating global monopole produces a repulsive grativational field outside the core in addition to a solid angular deficit in the Brans-Dicke theory. As a new feature, the angular deficit is dependent on the values of \phi_{\infty} and \omega, where \phi_{\infty} is asymptotic value of scalar field in space-like infinity and \omega is the Brans-Dicke parameter.