Space of solutions of the Ashtekar-Olmedo-Singh effective black hole model

TL;DR

This paper explores the full range of solutions in an effective loop quantum gravity black hole model, revealing how different integration constants influence geometry, thermodynamics, and horizon properties.

Contribution

It provides a comprehensive analysis of the entire solution space of the model, including exotic behaviors and thermodynamical modifications due to integration constant choices.

Findings

Solution space is broader than previously considered.

Hawking temperature depends on integration constants.

Matching conditions at horizons constrain solutions.

Abstract

We consider a general choice of integration constants in the resolution of the dynamical equations derived from a recently proposed effective model that describes black hole spacetimes in the context of loop quantum cosmology. The interest of our analysis is twofold. On the one hand, it allows for a study of the entire space of solutions of the model, which is absent in the literature and is fundamental for understanding the relation with any underlying quantum theory. On the other hand, choices of integration constants that generalize the type of solutions considered so far may lead to exotic behaviors in the effective black hole geometry, as well as modified thermodynamical properties. With these motivations in mind, we discuss the interior and exterior geometries, and present the conditions that a satisfactory matching at the horizons imposes. Then, we turn our attention to the Hawking temperature associated with the black horizon of the model, which we find to be affected by the freedom of choice of integration constants. Finally, we briefly comment on the asymptotic structure of the general solution and compare different notions of mass.