134 citations · 134 across the 1 of their papers we have counts for
7 papers
Causal Sets: Discrete Gravity (Notes for the Valdivia Summer School)
Rafael D. Sorkin
These are lecture notes on causal set theory prepared in Jan. 2002 for a Summer School in Valdivia, Chile. In some places, they are more complete, in others much less so, regrettab…
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…
Spin and statistics in quantum gravity
H. F. Dowker, R. D. Sorkin
We present a review of the spin and statistics of topological geons, particles in 3+1 quantum gravity. They can have half-odd-integral spin and fermionic statistics and since the u…
An energy bound deduced from the vanishing of the radiation reaction force during uniform acceleration
Rafael D. Sorkin
We deduce from energy conservation a lower bound on the mass of any system capable of imparting a constant acceleration to a charged body. We also point out a connection between th…
How Wrinkled is the Surface of a Black Hole?
Rafael D. Sorkin
We present evidence that, below a certain threshold scale, the horizon of a black hole is strongly wrinkled, with its shape manifesting a self-similar (``fractal'') spectrum of flu…
Two Topics concerning Black Holes: Extremality of the Energy, Fractality of the Horizon
Rafael D. Sorkin
We treat two aspects of the physics of stationary black holes. First we prove that the proportionality, d(energy) ~ d(area) for arbitrary perturbations (``extended first law''), fo…