83 citations · 213 across the 7 of their papers we have counts for
7 papers
"Observables" in causal set cosmology
Graham Brightwell, H. Fay Dowker, Raquel S. Garcia +2
The ``generic'' family of classical sequential growth dynamics for causal sets provides cosmological models of causal sets which are a testing ground for ideas about the, as yet un…
General Covariance and the "Problem of Time" in a Discrete Cosmology
Graham Brightwell, H. Fay Dowker, Joe Henson +2
Identifying an appropriate set of ``observables'' is a nontrivial task for most approaches to quantum gravity. We describe how it may be accomplished in the context of a recently p…
K-causality and degenerate spacetimes
H. F. Dowker, R. S. Garcia, S. Surya
The causal relation was introduced by Sorkin and Woolgar to extend the standard causal analysis of spacetimes to those that are only . Most of their results also h…
Morse index and causal continuity. A criterion for topology change in quantum gravity
H. F. Dowker, R. S. Garcia, S. Surya
Studies in 1+1 dimensions suggest that causally discontinuous topology changing spacetimes are suppressed in quantum gravity. Borde and Sorkin have conjectured that causal disconti…
Existence of Spinorial States in Pure Loop Quantum Gravity
M. Arnsdorf, R. S. Garcia
We demonstrate the existence of spinorial states in a theory of canonical quantum gravity without matter. This should be regarded as evidence towards the conjecture that bound stat…
Causal continuity in degenerate spacetimes
A. Borde, H. F. Dowker, R. S. Garcia +2
A change of spatial topology in a causal, compact spacetime cannot occur when the metric is globally Lorentzian. One can however construct a causal metric from a Riemannian metric…