Journal
PHYSICS LETTERS B
Volume 665, Issue 4, Pages 310-313Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2008.06.011
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We provide a new method to construct the S-matrix in quantum field theory. This method implements crossing symmetry manifestly by erasing the a priori distinction between in- and out-states. it allows the description of processes where the interaction weakens with distance in space, but remains strong in the center at all times. It should also be applicable to certain spacetimes where the conventional method fails due to lack of temporal asymptotic states. (C) 2008 Elsevier B.V. All rights reserved.
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