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We study bosonisation in the massive Thirring and sine-Gordon models at finite temperature T and nonzero fermion chemical potential μ. For that purpose we use both canonical operator and path integral approaches, paying particular attention to the issues of thermal normal ordering and renormalisation. At T > 0 and μ = 0, the massive Thirring model bosonises… (More)

We show the results for the scattering poles associated to the ρ, f0, a0, K ∗, σ and κ resonances in meson-meson scattering. Our amplitudes are obtained from the complete one-loop meson-meson scattering amplitudes from Chiral Perturbation Theory. Once unitarized with the Inverse Amplitude Method, they describe remarkably well the data simultaneously in the… (More)

We review our recent work on Chiral Lagrangians out of thermal equilibrium, which are introduced to analyse the pion gas formed after a Relativistic Heavy Ion Collision. Chiral Perturbation Theory is extended by letting fπ be time dependent and allows to describe explosive production of pions in parametric resonance. This mechanism could be relevant if… (More)

We analyse the extension of Chiral Perturbation Theory to describe a meson gas out of thermal equilibrium. For that purpose, we let the pion decay constant be a time-dependent function and work within the SchwingerKeldysh contour technique. A useful connection with curved space-time QFT allows to consistently renormalise the model, introducing two new… (More)

We present recent results on a systematic method to calculate transport coefficients for a meson gas (in particular, we analyze a pion gas) at low temperatures in the context of Chiral Perturbation Theory (ChPT). Our method is based on the study of Feynman diagrams taking into account collisions in the plasma by means of the non-zero particle width. This… (More)

- Daniel Fernández-Fraile, Angel Gómez Nicola
- Physical review letters
- 2009

We calculate the bulk viscosity of the massive pion gas within unitarized chiral perturbation theory. We obtain a low-temperature peak arising from explicit conformal breaking due to the pion mass and another peak near the critical temperature, dominated by the conformal anomaly through gluon condensate terms. The correlation between bulk viscosity and… (More)

We review our recent work on thermal meson properties within the Chiral Perturbation Theory framework. We will focus on the pion electromagnetic form factor, stressing its importance for Relativistic Heavy Ion Collisions. We obtain modelindependent predictions (based only on chiral symmetry) such as the temperature dependence of the pion electromagnetic… (More)

We present and analyze a new set of Ward Identities which shed light on the distinction between different patterns of chiral symmetry restoration in QCD, namely O(4) vs O(4) × U(1)A. The degeneracy of chiral partners for all scalar and pseudoscalar meson nonet members are studied through their corresponding correlators. In particular, we conclude that the… (More)

We analyze the isospin-breaking corrections to quark condensates within one-loop SU(2) and SU(3) Chiral Perturbation Theory including mu 6= md as well as electromagnetic (EM) contributions. The explicit expressions are given and several phenomenological aspects are studied. We analyze the sensitivity of recent condensate determinations to the EM low-energy… (More)

The imaginary time generating functional Z for the massless Schwinger model at nonzero chemical potential m and temperature T is studied in a torus with spatial length L . The lack of Hermiticity of the Dirac operator gives rise to a nontrivial mand T-dependent phase J in the effective action. When the Dirac operator has no zero modes ~trivial sector!, we… (More)