June 29, 2015 to July 3, 2015
Europe/Rome timezone

Chiral dynamics in the low-temperature phase of QCD

Jul 2, 2015, 5:10 PM
Aula Magna (Building E, Polo Fibonacci, Pisa)

Aula Magna

Building E, Polo Fibonacci, Pisa

Talk Goldstone Boson Working Group Parallel Session 6 - Goldstone Boson WG


Daniel Robaina (Institute of Nuclear Physics, Mainz)


We investigate the low-temperature phase of strongly interacting matter and the crossover region with two light flavors of quarks in Lattice QCD. Based on Chiral Ward Identities we test the applicability of a fixed-temperature chiral expansion given that chiral symmetry is spontaneously broken. It indicates that a sharp real-time excitation persists with the quantum numbers of the pion consistently with Goldstone's theorem even at T=150 MeV. We determine the real part of the pole and its residue in the axial-charge density correlator at zero and finite momentum. The time-dependent correlators are also analyzed using the Maximum Entropy method and the Backus-Gilbert method yielding consistent results. In addition, we also test the predictions of ordinary chiral perturbation theory around the point (T=0, m=0) for the temperature dependence of static observables. Around the crossover region, we find that all quantities considered depend only mildly on the quark mass in the range 8 MeV <= overline{m}^{overline{MS}} <= 15 MeV}.

Primary author

Daniel Robaina (Institute of Nuclear Physics, Mainz)


Dr Anthony Francis (University Toronto) Dr Bastian Brandt (University of Regensburg) Prof. Harvey B. Meyer (Institute of Nuclear Physics Mainz)

Presentation materials