Wednesday, July 3, 2013

1307.0482 (Marcos Brum et al.)

Modified Sorkin-Johnston states on Static and Expanding Spacetimes    [PDF]

Marcos Brum, Klaus Fredenhagen
We present a modification of the recently proposed Sorkin-Johnston states for scalar free quantum fields on a class of globally hyperbolic spacetimes. 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.
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