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7 papers · 1 filter
Time Walk Through the Quantum Cosmic String
Pedro F. Gonzalez-Diaz
Enforcing the spacetime of supermassive cosmic strings to satisfy the symmetry of a gravitational topological defect, that is a spacetime kink, it is shown that the energy of these…
Topological Descendants: DDK and KM Realizations
Beatriz Gato-Rivera, Jose Ignacio Rosado
The "minimal matter + scalar" system can be embedded into the twisted N=2 topological algebra in two ways: a la DDK or a la KM. Here we present some results concerning the topologi…
Real Ashtekar Variables for Lorentzian Signature Space-times
J. Fernando Barbero
I suggest in this letter a new strategy to attack the problem of the reality conditions in the Ashtekar approach to classical and quantum general relativity. By writing a modified…
Reality Conditions and Ashtekar Variables: a Different Perspective
J. Fernando Barbero
We give in this paper a modified self-dual action that leads to the -ADM formalism without having to face the difficult second class constraints present in other approaches…
A Perturbative/Variational Approach to Quantum Lattice Hamiltonians
J. G. Esteve, Germán Sierra
We propose a method to construct the ground state of local lattice hamiltonians with the generic form , where is a coupling constant and is a hamiltoni…
Quantum State of Wormholes and Topological Arrow of Time
Pedro F. Gonzalez-Diaz
This paper studies the time-symmetry problem in quantum gravity. The issue depends critically on the choice of the quantum state and has been considered in this paper by restrictin…