Pirner, H J | Engineering Papers

DOE OSTI2011

Boundary between hadron and quark-gluon structure of nuclei

We show that the boundary between quark-dominated and hadron-dominated regions of nuclear structure may be blurred by multinucleon quark clusters arising from color percolation. Recent experiments supporting partial percolation in cold nuclei and full percolation in hot/dense nuclear matter include deep inelastic lepton-nucleus scattering, relativistic heavy-ion collisions, and the binding energy in {sup 5}He{sub {Lambda}.}

73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗

DOE OSTI2011

QCD thermodynamics using five-dimensional gravity

We calculate the critical temperature and free energy of the gluon plasma using the dilaton potential [B. Galow, E. Megias, J. Nian, and H. J. Pirner, Nucl. Phys. B834, 330 (2010).] in the gravity theory of anti-de Sitter/QCD. The finite temperature observables are calculated in two ways: first, from the Page-Hawking computation of the free energy, and secondly using the Bekenstein-Hawking proportionality of the entropy with the area of the horizon. Renormalization is well defined, because the T=0 theory has asymptotic freedom. We further investigate the change of the critical temperature with the number of flavors induced by the change of the running coupling constant in the quenched theory. The finite temperature behavior of the speed of sound, spatial string tension and vacuum expectation value of the Polyakov loop follow from the corresponding string theory in AdS{sub 5}.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗