404 citations · 3.5k across the 79 of their papers we have counts for
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gr-qc2000★ 4 cited
Refractive gravitational waves and quantum fluctuations
John W. Barrett
Refractive gravitational waves are a generalisation of impulsive waves on a null hypersurface in which the metric is discontinuous but a weaker continuity condition for areas holds…
gr-qc2000★ 14 cited
State sum models for quantum gravity
John W. Barrett
This paper reviews the construction of quantum field theory on a 4-dimensional spacetime by combinatorial methods, and discusses the recent developments in the direction of a combi…
math.QA2000
Unlinked Embedded Graphs
John W. Barrett
This paper is a self-contained development of an invariant of graphs embedded in three-dimensional Euclidean space using the Jones polynomial and skein theory. Some examples of the…