Rotating tensor-multi-scalar solitons

TL;DR

This paper introduces rotating vacuum solutions in tensor-multi-scalar gravity theories, revealing stable, quantized angular momentum solitons akin to boson stars, with diverse scalar field configurations and interactions.

Contribution

It presents the first rotating vacuum solutions in tensor-multi-scalar theories, highlighting their stability and quantized angular momentum, expanding the understanding of solitonic objects in gravity.

Findings

Solutions behave like nontopological solitons.

Angular momentum is quantized.

Solutions depend on scalar field configurations and interactions.

Abstract

In the context of a special class of tensor-multi-scalar theories of gravity for which the target-space metric admits an isometry under which the theory is invariant, we present rotating vacuum solutions, namely with no matter fields. These objects behave like nontopological solitons, whose primary stability is due to the conserved charge arising from the global symmetry. We consider theories with two and three scalar fields, different Gauss curvatures and quartic interaction coefficients. As it occurs for boson stars, their angular momentum is quantized.