Generalized dilaton gravity in 2d

TL;DR

This paper explores the most general 2D dilaton gravity models that preserve local Lorentz invariance, focusing on a subclass with black hole solutions transitioning from AdS2 to dS2, and discusses their holographic properties.

Contribution

It introduces a new class of exactly soluble 2D dilaton gravity models with black holes that interpolate between AdS2 and dS2, including their thermodynamics and holographic features.

Findings

Identified a 3-parameter family of models with AdS2 to dS2 black hole solutions.

Analyzed boundary charges, asymptotic symmetries, and holographic renormalization.

Models are exactly soluble despite non-power-counting renormalizability.

Abstract

Generalized dilaton gravity in 2d is the most general consistent deformation of the Jackiw-Teitelboim model that maintains local Lorentz invariance. The action is generically not power-counting renormalizable, thus going beyond the class of models typically studied. Nevertheless, all these models are exactly soluble. We focus on a subclass of dilaton scale invariant models. Within this subclass, we identify a 3-parameter family of models that describe black holes asymptoting to AdS2 in the UV and to dS2 in the IR. Since these models could be interesting for holography, we address thermodynamics and boundary issues, including boundary charges, asymptotic symmetries and holographic renormalization.