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Abstract
We propose a new approach to collective phenomena in a linear σ model which includes classical vector–isovector and pseudovector–isovector fields. The main purpose is to describe meson modes composed of two ingredients: phenomenological structureless fields and [Formula: see text] excitations of the vacuum. This procedure, performed in the context of many-body techniques, provides a natural renormalization process through the [Formula: see text] excitations.
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