Energy-momentum tensor for scalar fields coupled to the dilaton in two dimensions

1998/08/31 by Fernando C. Lombardo, Francisco D. Mazzitelli, Jorge G. Russo · 2 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Quantum Electrodynamics and Casimir Effect #gr-qc #hep-th

paper · pdf · doi:10.1103/physrevd.59.064007

published as Phys.Rev. D59 (1999) 064007 · 18 pages, RevTex, no figures. Some changes have been added. To appear in Physical Review D

arxiv created 1998/12/01 · openalex publication_date 1999/02/02 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01

Abstract

We clarify some issues related to the evaluation of the mean value of the energy-momentum tensor for quantum scalar fields coupled to the dilaton field in two-dimensional gravity. Because of this coupling, the energy-momentum tensor for matter is not conserved and therefore it is not determined by the trace anomaly. We discuss different approximations for the calculation of the energy-momentum tensor and show how to obtain the correct amount of Hawking radiation. We also compute cosmological particle creation and quantum corrections to the Newtonian potential.

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