45 citations · 224 across the 13 of their papers we have counts for
5 papers · 1 filter
Horizon Molecules in Causal Set Theory
Christopher Barton, Andrew Counsell, Fay Dowker +3
We propose a new definition of "horizon molecules" in Causal Set Theory following pioneering work by Dou and Sorkin. The new concept applies for any causal horizon and its intersec…
Boundary and Corner Terms in the Action for General Relativity
Ian Jubb, Joseph Samuel, Rafael Sorkin +1
We revisit the action principle for general relativity motivated by the path integral approach to quantum gravity. We consider a spacetime region whose boundary has piecewise …
The Geometry of Small Causal Cones
Ian Jubb
We derive a formula for the spacetime volume of a small causal cone. We use this formula within the context of causal set theory to construct causal set expressions for certain geo…
The Sorkin-Johnston State in a Patch of the Trousers Spacetime
Michel Buck, Fay Dowker, Ian Jubb +1
A quantum scalar field in a patch of a fixed, topology-changing, dimensional "trousers" spacetime is studied using the Sorkin-Johnston formalism. The isometry group of the pa…
Boundary Terms for Causal Sets
Michel Buck, Fay Dowker, Ian Jubb +1
We propose a family of boundary terms for the action of a causal set with a spacelike boundary. We show that in the continuum limit one recovers the Gibbons-Hawking-York boundary t…