Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2007-09-10
Phys.Rev.D77:084016,2008
Physics
High Energy Physics
High Energy Physics - Theory
21 pages, 4 figures
Scientific paper
10.1103/PhysRevD.77.084016
It is well known that in Lorentz invariant quantum field theories in flat space the commutator of space-like separated local operators vanishes (microcausality). We provide two different arguments showing that this is a consequence of the causal structure of the classical theory, rather than of Lorentz invariance. In particular, microcausality holds in arbitrary curved space-times, where Lorentz invariance is explicitly broken by the background metric. As illustrated by an explicit calculation on a cylinder this property is rather non trivial at the level of Feynman diagrams.
Dubovsky Sergei
Nicolis Alberto
Trincherini Enrico
Villadoro Giovanni
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