Selected challenges in low-energy QCD and hadron physics

Abstract

This presentation briefly addresses three basic issues of low-energy QCD: first, whether the Nambu-Goldstone scenario of spontaneous chiral symmetry breaking is well established_s19 secondly, whether there is a dynamical entanglement of the chiral and deconfinement crossover transitions in QCD_s19 and thirdly, what is the status of knowledge about the phase diagram of QCD at low temperature and non-zero baryon density. These three topics were injected as key words into a panel discussion at the Schladming school on Challenges in QCD. The following exposition reflects the style and character of the discussions, with no claim of completeness.