Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2003-09-16
Phys.Lett. B574 (2003) 309-318
Physics
High Energy Physics
High Energy Physics - Theory
enlarged version of hep-th/0307096 containing the quantum stress tensor for arbitrary geometries and discussion of the Hawking
Scientific paper
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.
Fabbri Alessandro
Farese Sara
Navarro-Salas Jose
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