Wednesday, June 5, 2013

1306.0629 (Gianluca Calcagni et al.)

Quantum field theory with varying couplings    [PDF]

Gianluca Calcagni, Giuseppe Nardelli
A quantum scalar field theory with spacetime-dependent coupling is studied. Surprisingly, while translation invariance is explicitly broken in the classical theory, momentum conservation is recovered at the quantum level for certain shapes of the coupling's profile. For one of these cases, some tree and one-loop diagrams are calculated. This is an example of a theory where violation of Lorentz symmetry is not enhanced at the quantum level. We draw some consequences for the renormalization properties of certain classes of fractional field theories.
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