Finite propagation speed and causal free quantum fields on networks

Details Finite propagation speed and causal free quantum fields on networks Finite propagation speed and causal free quantum fields on networks

2009-07-09

arxiv.org/abs/0907.1522v1

J.Phys.A42:495401,2009

Physics

High Energy Physics

High Energy Physics - Theory

Scientific paper

10.1088/1751-8113/42/49/495401

Laplace operators on metric graphs give rise to Klein-Gordon and wave operators. Solutions of the Klein-Gordon equation and the wave equation are studied and finite propagation speed is established. Massive, free quantum fields are then constructed, whose commutator function is just the Klein-Gordon kernel. As a consequence of finite propagation speed Einstein causality (local commutativity) holds. Comparison is made with an alternative construction of free fields involving RT-algebras.

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