In-medium Pion-Pion Interaction and Chiral Symmetry Restoration
D. Davesne, Y. J. Zhang, G. Chanfray, J. Wambach
Abstract
We discuss medium modifications of the unitarized pion-pion interaction in the nuclear medium. We incorporate both the effects of chiral symmetry restoration and the influence of collective nuclear pionic modes, originating from the p-wave coupling of the pion to delta-hole configurations. We show how the resulting strong enhancement of the sigma-meson spectral function is related to large fluctuations of the condensate associated with the partial restoration of chiral symmetry.
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