Weyl Invariance and Spurious Black Hole in Two-Dimensional Dilaton Gravity

Details Weyl Invariance and Spurious Black Hole in Two-Dimensional Dilaton Gravity Weyl Invariance and Spurious Black Hole in Two-Dimensional Dilaton Gravity

1993-08-20

arxiv.org/abs/hep-th/9308095v1

Int. J. Mod. Phys. A9 (1994) 4811-4835

Physics

High Energy Physics

High Energy Physics - Theory

28 pages, KANAZAWA-93-06

Scientific paper

In two-dimensional dilaton gravity theories, there may exist a global Weyl invariance which makes black hole spurious. If the global invariance and the local Weyl invariance of the matter coupling are intact at the quantum level, there is no Hawking radiation. We explicitly verify the absence of anomalies in these symmetries for the model proposed by Callan, Giddings, Harvey and Strominger. The crucial observation is that the conformal anomaly can be cohomologically trivial and so not truly anomalous in such dilaton gravity models.

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