TY - JOUR

T1 - Nuclear chiral dynamics and phases of QCD

AU - Weise, W.

N1 - Funding Information:
Sincere thanks go to my collaborators Nino Bratovic, Salvatore Fiorilla, Thomas Hell, Jeremy Holt, Norbert Kaiser, Bertram Klein and Bernhard Röttgers, whose works have contributed substantially to this report. This work was partially supported by grants from BMBF , GSI and by the DFG Cluster of Excellence “Origin and Structure of the Universe” .

PY - 2012/4

Y1 - 2012/4

N2 - This presentation starts with a brief review of our current picture of QCD phases, derived from lattice QCD thermodynamics and from models based on the symmetries and symmetry breaking patterns of QCD. Typical approaches widely used in this context are the PNJL and chiral quark-meson models. It is pointed out, however, that the modeling of the phase diagram in terms of quarks as quasiparticles misses important and well known nuclear physics constraints. In the hadronic phase of QCD governed by confinement and spontaneously broken chiral symmetry, in-medium chiral effective field theory is the appropriate framework, with pions and nucleons as active degrees of freedom. Nuclear chiral thermodynamics is outlined and the liquidgas phase transition is described. The density and temperature dependence of the chiral condensate is deduced. As a consequence of two- and three-body correlations in the nuclear medium, no tendency towards a first-order chiral phase transition is found at least up to twice the baryon density of normal nuclear matter and up to temperatures of about 100 MeV. Isospin-asymmetric nuclear matter and neutron matter are also discussed. An outlook is given on new tightened constraints for the equation-of-state of cold and highly compressed matter as implied by a recently observed two-solar-mass neutron star.

AB - This presentation starts with a brief review of our current picture of QCD phases, derived from lattice QCD thermodynamics and from models based on the symmetries and symmetry breaking patterns of QCD. Typical approaches widely used in this context are the PNJL and chiral quark-meson models. It is pointed out, however, that the modeling of the phase diagram in terms of quarks as quasiparticles misses important and well known nuclear physics constraints. In the hadronic phase of QCD governed by confinement and spontaneously broken chiral symmetry, in-medium chiral effective field theory is the appropriate framework, with pions and nucleons as active degrees of freedom. Nuclear chiral thermodynamics is outlined and the liquidgas phase transition is described. The density and temperature dependence of the chiral condensate is deduced. As a consequence of two- and three-body correlations in the nuclear medium, no tendency towards a first-order chiral phase transition is found at least up to twice the baryon density of normal nuclear matter and up to temperatures of about 100 MeV. Isospin-asymmetric nuclear matter and neutron matter are also discussed. An outlook is given on new tightened constraints for the equation-of-state of cold and highly compressed matter as implied by a recently observed two-solar-mass neutron star.

KW - Chiral effective field theory

KW - Matter under extreme conditions

KW - Nuclear many-body problem

KW - QCD phase diagram

UR - http://www.scopus.com/inward/record.url?scp=84859157576&partnerID=8YFLogxK

U2 - 10.1016/j.ppnp.2011.12.034

DO - 10.1016/j.ppnp.2011.12.034

M3 - Article

AN - SCOPUS:84859157576

SN - 0146-6410

VL - 67

SP - 299

EP - 311

JO - Progress in Particle and Nuclear Physics

JF - Progress in Particle and Nuclear Physics

IS - 2

ER -