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Studies on the SJ vacuum in de Sitter spacetime
A bstractIn this work we study the Sorkin-Johnston (SJ) vacuum in de Sitter spacetime for free scalar field theory. For the massless theory we find that the SJ vacuum can neither be obtained from theExpand
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A Spacetime Approach to Defining Vacuum States and Entropy
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-dimensional MinkowskiExpand
Entanglement Entropy of Causal Set de Sitter Horizons
de Sitter cosmological horizons are known to exhibit thermodynamic properties similar to black hole horizons. In this work we study causal set de Sitter horizons, using Sorkin's spacetimeExpand
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