Two Dimensional Quantum Dilaton Gravity and the Positivity of Energy

Details Two Dimensional Quantum Dilaton Gravity and the Positivity of Energy Two Dimensional Quantum Dilaton Gravity and the Positivity of Energy

1993-02-28

arxiv.org/abs/hep-th/9302144v2

Phys.Rev. D49 (1994) 941-946

Physics

High Energy Physics

High Energy Physics - Theory

16 pages, phyzzx, COLO-HEP-309. (Confusing points in previous version clarified, discussion of ADM and Bondi masses in RST cas

Scientific paper

10.1103/PhysRevD.49.941

Using an argument due to Regge and Teitelboim, an expression for the ADM mass of 2d quantum dilaton gravity is obtained. By evaluating this expression we establish that the quantum theories which can be written as a Liouville-like theory, have a lower bound to energy, provided there is no critical boundary. This fact is then reconciled with the observation made earlier that the Hawking radiation does not appear to stop. The physical picture that emerges is that of a black hole in a bath of quantum radiation. We also evaluate the ADM mass for the models with RST boundary conditions and find that negative values are allowed. The Bondi mass of these models goes to zero for large retarded times, but becomes negative at intermediate times in a manner that is consistent with the thunderpop of RST.

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