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Conformal scalar fields coupled to the dilaton appear naturally in two-dimensional models of black hole evaporation. We show that their trace anomaly is (1/24π)[R-6(∇φ)²-2φ]. It follows that a Russo-Susskind-Thorlacius--type counterterm appears naturally in the one-loop effective action.
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Bousso et al. (1997) studied this question.
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