Q-stars in scalar-tensor gravitational theories in extra dimensions

TL;DR

This paper investigates q-star solutions within scalar-tensor gravitational theories in higher dimensions, revealing small parameter differences compared to General Relativity in various spacetime configurations.

Contribution

It extends the study of q-stars to scalar-tensor theories in extra dimensions, analyzing their properties and stability.

Findings

Parameters of stable stars differ by a few percent from General Relativity.

Stable q-star configurations exist in 3 to 6 dimensions.

The gravitational theory influences star characteristics slightly.

Abstract

We present Jordan-Brans-Dicke and general scalar-tensor gravitational theory in extra dimensions in an asymptotically flat or anti de Sitter spacetime. We consider a special gravitating, boson field configuration, a $q$-star, in 3, 4, 5 and 6 dimensions, within the framework of the above gravitational theory and find that the parameters of the stable stars are a few per cent different from the case of General Relativity.