%0 Journal Article
%T "Vacuum-like" Hadamard states for quantum fields on curved spacetimes
%A Marcos Brum
%A Klaus Fredenhagen
%J Physics
%D 2013
%I arXiv
%R 10.1088/0264-9381/31/2/025024
%X 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.
%U http://arxiv.org/abs/1307.0482v2