Exotic compact objects and light bosonic fields

TL;DR

This paper examines how light bosonic fields affect the spacetime around exotic compact objects, revealing significant deviations from black hole models unless these fields are decoupled or heavy.

Contribution

It demonstrates that light bosonic fields generally cause large deviations in the spacetime of exotic compact objects, challenging the common assumption of black hole-like behavior.

Findings

Light bosonic fields induce significant spacetime deviations.

Black hole models may not accurately describe exotic objects with light fields.

Assumption of decoupled or heavy fields is crucial for black hole analogy.

Abstract

In this note, we discuss the effect of light, non-gauge, bosonic degrees of freedom on the exterior spacetime of an exotic compact object. We show that such fields generically introduce large deviations from black hole spacetimes of General Relativity near and outside the surfaces of ultra-compact exotic objects unless one assumes they totally decouple from the standard model or new heavy fields. Hence, using black hole spacetimes of General Relativity to model ultra-compact exotic objects and their perturbations relies implicitly on this assumption or on the absence of such fields.