Two & Many Pions

por Felipe J. Llanes-Estrada (Dpto. Fisica Teorica I, Complutense (Madrid))

martes 6 may. 2003 12:00 → 13:00 Europe/Madrid

Sala Seminarios IFIC (Edf. Institutos de Investigación)

I will spend about a third of the time at a level appropriate for beginning graduate students, reviewing some topics in a hot pion gas such as resonance properties and transport coefficients. A more technical discussion will follow describing the chiral perturbation theory pion-pion scattering amplitude in a thermal bath with the Matsubara formalism, its unitarization via the Inverse Amplitude Method (IAM) and behaviour of low-lying resonances (rho and sigma). As a further application of the IAM I will briefly describe our approach to kinetic equations and the shear viscosity of a hot, dense pion gas. Finally, and time permitting, I will address an ongoing Schwinger-Dyson quark calculation valid for relativistic, non local (Global Color Model type) quark models, giving access to the l1 and l2 coefficients of the chiral lagrangian.