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2010

Trace Anomaly, Massless Scalars and the Gravitational Coupling of QCD

Armillis, Roberta, Coriano, Claudio, Rose, Luigi Delle

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The anomalous effective action describing the coupling of gravity to a non-abelian gauge theory can be determined by a variational solution of the anomaly equation, as shown by Riegert long ago.

It is given by a nonlocal expression, with the nonlocal interaction determined by the Green's function of a conformally covariant operator of fourth order.
In recent works it has been shown that this interaction is mediated by a simple pole in an expansion around a Minkowski background, coupled in the infrared in the massless fermion limit.
This result relies on the local formulation of the original action in terms of two auxiliary fields, one physical scalar and one ghost, which take the role of massless composite degrees of freedom.

Trace Anomaly, Massless Scalars and the Gravitational Coupling of QCD · Around

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