11,730 research outputs found
Light clusters in nuclear matter of finite temperature
We investigate properties and the distribution of light nuclei (A<4) in
symmetric nuclear matter of finite temperature within a microscopic framework.
For this purpose we have solved few-body Alt-Grassberger-Sandhas type equations
for quasi-nucleons that include self-energy corrections and Pauli blocking in a
systematic way. In a statistical model we find a significant influence in the
composition of nuclear matter if medium effects are included in the microscopic
calculation of nuclei. If multiplicities are frozen out at a certain time (or
volume), we expect significant consequences for the formation of light
fragments in a heavy ion collision. As a consequence of the systematic
inclusion of medium effects the ordering of multiplicities becomes opposite to
the law of mass action of ideal components. This is necessary to explain the
large abundance of -particles in a heavy ion collision that are
otherwise largely suppressed in an ideal equilibrium scenario.Comment: 9 pages, 9 figures, epja-style file
Dissociation of hadrons in quark matter within finite temperature field theory approach on the light front
We present a relativistic three-body equation to investigate the properties
of nucleons in hot and dense nuclear/quark matter. Within the light front
approach we utilize a zero-range interaction to study the three-body dynamics.
The relativistic in-medium equation is derived within a systematic Dyson
equation approach that includes the dominant medium effects due to Pauli
blocking and self energy corrections. We present the in-medium nucleon mass and
calculate the dissociation of the three-body system.Comment: 4 pages, 2 figures. Presented by S. Mattiello at Light-Cone 2004,
Amsterdam, 16 - 20 Augus
Restoration of chiral symmetry in light-front finite temperature field theory
We investigate the properties of and states in hot and dense
quark matter in the framework of light-front finite temperature field theory.
Presently we use the Nambu Jona-Lasinio model of QCD and derive the gap
equation at finite temperature and density. We study pionic and scalar diquark
dynamics in quark matter and calculate the masses and the Mott dissociation as
a function of the temperature and the chemical potential . For the
scalar diquark we determine the critical temperature of color
superconductivity.Comment: 4 pages, 3 figures, Presented by S.Strau\ss at Light-Cone 2004,
Amsterdam, 16 - 20 Augus
Light front field theory of relativistic quark matter
Light-front quantization to many-particle systems of finite temperature and
density provides a novel approach towards a relativistic description of quark
matter and allows us to calculate the perturbative as well as the
non-perturbative regime of QCD. Utilizing a Dyson expansion of light-front
many-body Green functions we have so far calculated three-quark, quark-quark,
and quark-antiquark correlations that lead to the chiral phase transition, the
formation of hadrons and color superconductivity in a hot and/or dense
environment. Presently, we use an effective zero-range interaction, to compare
our results with the more traditional instant form approach where applicable.Comment: contribution to Quark Matter 2005, 18th International Conference on
Nucleus Nucleus Colisions, 4 pages, 2 figures, hiph-preprint.sty file neede
- …