Speaker
Description
For this presentation, we analyze a 1-loop corrected extension of the classical CGHS model of two-dimensional dilaton gravity. The 1-loop effective action consists of three key components, the first being the standard non-local Polyakov action, accounting for quantum fluctuations of matter fields, while the second is a Polyakov-type term constructed using an auxiliary flat metric, which captures fluctuations of ghost fields associated with the underlying reparametrization invariance. The third term is a local counterterm that preserves the flatness of the auxiliary metric, guarantees the exact solvability of the model, and ensures that 2D Minkowski space remains an exact solution of the backreacted equations. The analysis is performed in a regime where the total central charge of the theory is negative. In doing so, the classical spacetime singularity is resolved, suggesting the possible preservation of unitarity.
