52 citations · 172 across the 6 of their papers we have counts for
6 papers
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…
A preferred ground state for the scalar field in de Sitter space
Siavash Aslanbeigi, Michel Buck
We investigate a recent proposal for a distinguished vacuum state of a free scalar quantum field in an arbitrarily curved spacetime, known as the Sorkin-Johnston (SJ) vacuum, by ap…
A Ground State for the Causal Diamond in 2 Dimensions
Niayesh Afshordi, Michel Buck, Fay Dowker +3
We apply a recent proposal for a distinguished ground state of a quantum field in a globally hyperbolic spacetime to the free massless scalar field in a causal diamond in two-dimen…
Quantum Information Processing and Relativistic Quantum Fields
Dionigi M. T. Benincasa, Leron Borsten, Michel Buck +1
It is shown that an ideal measurement of a one-particle wave packet state of a relativistic quantum field in Minkowski spacetime enables superluminal signalling. The result holds f…
Inflation in models with Conformally Coupled Scalar fields: An application to the Noncommutative Spectral Action
Michel Buck, Malcolm Fairbairn, Mairi Sakellariadou
Slow-roll inflation is studied in theories where the inflaton field is conformally coupled to the Ricci scalar. In particular, the case of Higgs field inflation in the context of t…