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Paper detail

"Vacuum-like" Hadamard states for quantum fields on curved spacetimes

We present a modification of the recently proposed Sorkin-Johnston states for scalar free quantum fields on a class of globally hyperbolic spacetimes possessing compact Cauchy hypersurfaces. The modification relies on a smooth cutoff of the commutator function and leads always to Hadamard states, in contrast to the original Sorkin-Johnston states. The modified Sorkin-Johnston states are, however, due to the smoothing no longer uniquely associated to the spacetime.

preprint2013arXivOpen access
Marcos BrumKlaus Fredenhagen
math-phmath.MPgr-qc
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Marcos BrumKlaus Fredenhagen

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