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18 papers · 2 filters
U(N) tools for Loop Quantum Gravity: The Return of the Spinor
Enrique F. Borja, Laurent Freidel, Iñaki Garay +1
We explore the classical setting for the U(N) framework for SU(2) intertwiners for loop quantum gravity (LQG) and describe the corresponding phase space in terms of spinors with ap…
Acceleration radiation, transition probabilities, and trans-Planckian physics
I. Agullo, J. Navarro-Salas, G. J. Olmo +1
An important question in the derivation of the acceleration radiation, which also arises in Hawking's derivation of black hole radiance, is the need to invoke trans-Planckian physi…
Obtaining the Weyl tensor from the Bel-Robinson tensor
Joan J. Ferrando, Juan A. Sáez
The algebraic study of the Bel-Robinson tensor proposed and initiated in a previous work (Gen. Relativ. Gravit. {\bf 41}, see ref [11]) is achieved. The canonical form of the diffe…
Step-like discontinuities in Bose-Einstein condensates and Hawking radiation: dispersion effects
Carlos Mayoral, Alessandro Fabbri, Massimiliano Rinaldi
In this paper we extend the hydrodynamic results of [1] and study, analytically, the propagation of Bogoliubov phonons on top of Bose-Einstein condensates with step-like discontinu…
Semiclassical Gravity in the Far Field Limit of Stars, Black Holes, and Wormholes
Eric D. Carlson, Paul R. Anderson, Alessandro Fabbri +3
Semiclassical gravity is investigated in a large class of asymptotically flat, static, spherically symmetric spacetimes including those containing static stars, black holes, and wo…
Dynamics for a 2-vertex Quantum Gravity Model
Enrique F. Borja, Jacobo Diaz-Polo, Iñaki Garay +1
We use the recently introduced U(N) framework for loop quantum gravity to study the dynamics of spin network states on the simplest class of graphs: two vertices linked with an arb…