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We present a study of the $\pi\pi$ scattering amplitude in the $\sigma$ and$\rho$ channels at finite temperature and nuclear density within a chiralunitary framework. Meson resonances are dynamically generated in our approach,which allows us to analyze the behavior of their associated scattering poleswhen the system is driven towards chiral symmetry restoration. Medium effectsare incorporated in three ways: (a) by thermal corrections of the unitarizedscattering amplitudes, (b) by finite nuclear density effects associated to arenormalization of the pion decay constant, and complementarily (c) byextending our calculation of the scalar-isoscalar channel to account for finitenuclear density and temperature effects in a microscopic many-bodyimplementation of pion dynamics. Our results are discussed in connection withseveral phenomenological aspects relevant for nuclear matter and Heavy-IonCollision experiments, such as $\rho$ mass scaling vs broadening from dileptonspectra and chiral restoration signals in the $\sigma$ channel. We alsoelaborate on the molecular nature of $\pi\pi$ resonances.

Chiral Symmetry and light resonances in hot and dense matter