arXiv:nucl-th/0002032·v1·Nuclear Theory
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 and Fine Mechanics, Academia Sinica, Shanghai, China)🇨🇳 · G.Chanfray (Institut de Physique Nucleaire, Lyon, France)🇫🇷 · J. Wambach (IKP, Technische Universitat, Darmstadt, Germany)🇩🇪
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.
Comments: 8 pages, 3 Postscript figures, contribution to the `International Workshop XXVIII on Gross Properties of Nuclei and Nuclear Excitations', Hirschegg, Austria, January 16-22 2000