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arxiv: nucl-th/0002032 · v1 · submitted 2000-02-11 · ⚛️ nucl-th

In-medium Pion-Pion Interaction and Chiral Symmetry Restoration

D. Davesne (Institut de Physique Nucleaire , Lyon , France) , Y.J. Zhang (Joint Laboratory for Quantum Optics , Shanghai Institute of Optics , Fine Mechanics , Academia Sinica , Shanghai
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China) G.Chanfray (Institut de Physique Nucleaire J. Wambach (IKP Technische Universitat Darmstadt Germany)
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classification ⚛️ nucl-th
keywords chiralrestorationsymmetryinteractionmediumnuclearpion-pionassociated
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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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