Trace Anomaly of Dilaton Coupled Scalars in Two Dimensions

TL;DR

This paper calculates the trace anomaly of conformal scalar fields coupled to the dilaton in two dimensions, revealing the natural emergence of an RST-type counterterm in the effective action relevant for black hole models.

Contribution

It provides a detailed computation of the trace anomaly for dilaton-coupled scalars, clarifying their role in two-dimensional black hole evaporation models.

Findings

Trace anomaly computed for dilaton-coupled scalars.

RST-type counterterm identified in the effective action.

Implications for two-dimensional black hole physics.

Abstract

Conformal scalar fields coupled to the dilaton appear naturally in two-dimensional models of black hole evaporation. We calculate their trace anomaly. It follows that an RST-type counterterm appears naturally in the one-loop effective action.