Non - Topological Solitons in non-minimally coupled Scalar fields: Theory and consequences

TL;DR

This paper reviews non-topological soliton solutions in scalar-tensor gravity theories, discussing their formation, properties, and potential implications for dark matter and cosmology.

Contribution

It provides a comprehensive overview of non-topological solitons in non-minimally coupled scalar fields and explores their theoretical and cosmological consequences.

Findings

Existence of gravity halos ('g-balls') with varying gravitational constants.

Potential role of g-balls in explaining dark matter phenomena.

Implications for cosmological models with scalar fields.

Abstract

In theories of gravitation in which dimensional parameters are dynamically induced, one can have non - topological - soliton solutions. This article reviews related topics connected with such solutions. The existence of such solutions in curved spacetime can give rise to halos of gravity (g-) balls with gravitational ``constant" having different values inside and outside the ball. Such g - balls can have quite interesting bearing on the dark matter problem over galactic and cluster scales. We describe the origin of such solutions. We speculate on related problems in Cosmology. Such objects would naturally occur in a large class of induced gravity models in which we have scalar fields non minimally coupled to the scalar curvature.