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Search: authors:"Hirofumi Kubo"

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Apparently Noninvariant Terms of U(N) × U(N) Nonlinear Sigma Model in the One-Loop Approximation

We show how the Apparently Noninvariant Terms (ANTs), which emerge in perturbation theory of nonlinear sigma models, are consistent with the nonlinearly realized symmetry by employing the Ward-Takahashi identity (in the form of an inhomogeneous Zinn-Justin equation). In the literature the discussions on ANTs are confined to the SU(2) case. We generalize them to the U(N) case and...