16 citations · 16 across the 1 of their papers we have counts for
4 papers
Quantum Gravity and Turning Points in the Semiclassical Approximation
Esko Keski-Vakkuri, Samir D. Mathur
The wavefunctional in quantum gravity gives an amplitude for 3-geometries and matter fields. The four-space is usually recovered in a semiclassical approximation where the gravity…
A Note on the Semi-Classical Approximation in Quantum Gravity
Gilad Lifschytz, Samir D. Mathur, Miguel E. Ortiz
We re-examine the semiclassical approximation to quantum gravity in the canonical formulation, focusing on the definition of a quasiclassical state for the gravitational field. It…
Breakdown of the semiclassical approximation at the black hole horizon
E. Keski-Vakkuri, G. Lifschytz, S. D. Mathur +1
The definition of matter states on spacelike hypersurfaces of a 1+1 dimensional black hole spacetime is considered. The effect of small quantum fluctuations of the mass of the blac…
Evaporating Black Holes and Entropy
Esko Keski-Vakkuri, Samir D. Mathur
We study the Hawking radiation for the geometry of an evaporating 1+1 dimensional black hole. We compute Bogoliubov coefficients and the stress tensor. We use a recent result of Sr…