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The Feynman propagator for a free bosonic scalar field on the discrete spacetime of a causal set is presented.
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S. Johnston, 2008 Class. Quantum Grav. 25 202001, arXiv:0806.3083
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R. Sverdlov, L. Bombelli, 2009 Class. Quantum Grav. 26 075011, arXiv:0801.0240
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