This paper is concerned with the study of quasifree states of a linear, scalar quantum field in
globally hyperbolic spacetimes possessing a one-parameter group of isometries with a …

We present a first-principles derivation of the main results of the Kerr/CFT correspondence
and its extensions using only tools from gravity and quantum field theory. Firstly, we review …

Quantum gravity in the region very near the horizon of an extreme Kerr black hole (whose
angular momentum and mass are related by J= GM 2) is considered. It is shown that …

A bstract We prove that non-extremal black holes in four-dimensional general relativity
exhibit an infinite-dimensional symmetry in their near horizon region. By prescribing a …

A bstract We revisit the covariant phase space formalism applied to gravitational theories
with null boundaries, utilizing the most general boundary conditions consistent with a fixed …

The gravitational field in a spatially finite region is described as a microcanonical system.
The density of states ν is expressed formally as a functional integral over Lorentzian metrics …

We argue that the description of a block hole as a statistical (thermal) object must break
down as the extreme (zero-temperature) limit is a approached, due to uncontrollable …

The superradiant scattering of a scalar field with frequency and angular momentum (ω, m)
by a near-extreme Kerr black hole with mass and spin (M, J) was derived in the seventies by …

These notes introduce the subject of quantum field theory in curved spacetime and some of
its applications and the questions they raise. Topics include particle creation in time …

Physical effects in wormholes and time machines Page 1 PHYSICAL REVIEW D VOLUME 42,
NUMBER 4 Physical effects in wormholes and time machines 15 AUGUST 1990 Valery P …