Generalized Virasoro anomaly and stress tensor for dilaton coupled theories
arXiv:hep-th/0309160 · doi:10.1016/j.physletb.2003.09.012
Abstract
We derive the anomalous transformation law of the quantum stress tensor for a 2D massless scalar field coupled to an external dilaton. This provides a generalization of the Virasoro anomaly which turns out to be consistent with the trace anomaly. We apply it together with the equivalence principle to compute the expectation values of the covariant quantum stress tensor on a curved background. Finally we briefly illustrate how to evaluate vacuum polarization and Hawking radiation effects from these results.
enlarged version of hep-th/0307096 containing the quantum stress tensor for arbitrary geometries and discussion of the Hawking effect. To appear in Phys. Lett. B
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