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New Renormalization Group Equations and the Naturalness Problem · Around

2009

New Renormalization Group Equations and the Naturalness Problem

Pivovarov, Grigorii

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Looking for an observable manifestation of the so-called unnaturalness of scalar fields we introduce a seemingly new set of differential equations for connected Green functions.

These equations describe the momentum dependence of the Green functions and are close relatives to the previously known renormalization group equations.
Applying the new equations to the theory of scalar field with $\phi^4$ interaction we identify a relation between the four-point Green function and the propagator which expresses the unnaturalness of the scalar field.
Possible manifestations of the unnaturalness at low momenta are briefly discussed.

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G. Peter Lepage, “What is renormalization,” arXiv:hep-ph/0506330

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2010

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