1,090 research outputs found
Color Superconductivity at Moderate Density
The effect of color breaking on colored quarks' chiral condensates has been
investigated at zero temperature and moderate baryon density. It is found that
the influence of the diquark condensate on different colored quarks is very
small.Comment: 4 pages, 1 figure in eps, talk given at XXXI International Symposium
on Multiparticle Dynamics, Sept 1-7, 2001, Datong China. See
http://ismd31.ccnu.edu.cn
Massive Meson Fluctuation in NJL Model
Based on the self-consistent scheme beyond mean-field approximation in the
large expansion, including current quark mass explicitly, a general
scheme of SU(2) NJL model is developed. To ensure the quark self-energy
expanded in the proper order of , an approximate internal meson propagator
is deduced, which is in order of . In our scheme, adopting the method
of external momentum expansion, all the Feynman diagrams are calculated in a
unified way by only expanding the quark propagator. Our numerical results show,
that different from the mean field approximation in which the explicitly chiral
symmetry breaking is invisible, the effect of finite pion mass can be seen
clearly when beyond mean-field approximation.Comment: 1 REVTeX file, 19 pages including 3 eps figure
On the instability of inviscid, compressible free shear layers
The linear spatial instability of inviscid
compressible laminar mixing of two parallel
streams, comprised of the same gas, has been
investigated with respect to two-dimensional wave
disturbances. The effects of the velocity ratio,
temperature ratio, and the temperature profile
across the shear layer have been examined. A
nearly universal dependence of the normalized
maximum amplification rate on the convective Mach
number is found, with the normalized maximum
amplification rate decreasing significantly with
increasing convective Mach number in the subsonic
region. These results are in accord with those of
recent growth rate experiments in compressible
turbulent free shear layers and other similar
recent calculations
An Analytic Solution of Hydrodynamic Equations with Source Terms in Heavy Ion Collisions
The energy and baryon densities in heavy ion collisions are estimated by
analytically solving a 1+1 dimensional hydrodynamical model with source terms.
Particularly, a competition between the energy and baryon sources and the
expansion of the system is discussed in detail.Comment: LaTeX2e, 7 pages, 4 postscript figures, submitted to Int. J. Mod.
Phys.
- …