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gr-qc2026
Spectral Density of the Causal Propagator
Joshua Y. L. Jones, Yasaman K. Yazdi
The causal propagator (or Pauli-Jordan function), which multiplied by is the spacetime commutator of the field , plays an essential role in scalar quantum field t…
gr-qc2024
Principles for a Distinguished Global Vacuum: Entropy and the Vacuum State in Causal Set Theory
Joshua Y. L. Jones
Using the framework of real scalar field theory on causal sets, the intimate relation of the Sorkin-Johnston vacuum to entropic purity is elucidated. It is shown that taking a set…