Frozen boson stars in an infinite tower of higher-derivative gravity

TL;DR

This paper introduces a new class of five-dimensional boson star solutions with infinite higher-curvature corrections, revealing regular, 'frozen star' configurations that resemble black holes and could shed light on black hole interiors and information paradoxes.

Contribution

It presents the first regular, higher-derivative corrected boson star solutions in five dimensions, including the novel 'frozen star' configuration near zero frequency.

Findings

Existence of a broader frequency range for solutions with higher curvature corrections.

Regular 'frozen star' solutions emerge as the correction order increases.

Solutions suggest a new perspective on black hole interiors and information paradoxes.

Abstract

In this paper, we present a solution for a five-dimensional boson star under gravity with infinite tower of higher curvature corrections. We discover that when the coupling constant exceeds a certain threshold, an alternative configuration emerges, distinct from the conventional five-dimensional boson star. This new structure is characterized by a broader frequency range, with its minimum value approaching zero. At a truncation of $n=2$ for the correction order, the solution and its scalar curvature diverge as the frequency approaches zero. However, as the order of higher curvature corrections increases, the singularity at the center vanishes, resulting in a globally regular solution. Additionally, as the frequency approaches zero, the scalar field's radial distribution becomes concentrated within the critical radius $r_c$, forming what we term a ``frozen star". Beyond this radius, the metric of the frozen star almost degenerates into that of an extreme black hole. The solutions for such frozen stars offer a new avenue for exploring the enigmatic interiors of compact celestial bodies, enhancing our understanding of the internal structure of black holes under semi-classical conditions and potentially addressing the series of paradoxes associated with information loss due to singularities and horizons.