Title: 
       Origin of hadron mass and phases of QCD at finite density

Presented by Leonid Glozman, University of Graz

We discuss phases of QCD at finite density and not high temperature,
below and above the chiral restoration phase transition. In order to
decide about the phase diagram of QCD, it is necessary to understand
origin of hadron mass, whether it is entirely due to a quark
condensate or not. We analyze excited hadron spectra and show that
mass of excited hadrons has mostly the chiral-invariant origin. Then
it is quite likely that above the chiral restoration point at finite
chemical potential, one would have a new phase that represents a
confining but chirally symmetric matter, rather than a deconfining
quark-gluon matter. We discuss some properties of this matter and show
that above the chiral restoration point it represents a new kind of a
fermi system, with a gap in the excitation spectrum that increases
with the chemical potential. This gap is not due to condensation of
the quasi Cooper pairs. It is only due to such properties as
confinement and manifest chiral symmetry at the same time.