60 research outputs found
Quark induced excitations of the instanton liquid
The selfconsistent approach to the quark interactions in the instanton liquid
is developed within the tadpole approximation calculating the basic functional
integral. The effective Lagrangian obtained includes colourless scalar field
interacting with quarks. The origin of this dynamical field as an interaction
carrier in soft momentum region is discussed.Comment: 17 pages, 1 figure ps.file. Slightly revised improved versio
Instanton vacuum at finite density of quark matter
We study light quark interactions in the instanton liquid at finite
quark/baryon number density analyzing chiral and diquark condensates and
investigate the behaviors of quark dynamical mass and both condensates together
with instanton liquid density as a function of quark chemical potential. We
conclude the quark impact (estimated in the tadpole approximation) on the
instanton liquid could shift color superconducting phase transition to higher
values of the chemical potential bringing critical quark matter density to the
values essentially higher than conventional nuclear one.Comment: Lattice 2001 (Non-zero temperature and density), 3 pages, 4 figure
Simple Mechanism of Softening Structure Functions at Low Transverse Momentum Region
The relevance of the dipole configurations of quarks in forming nucleus
structure functions is discussed. It is shown that a radiation generated by
dipole configurations while moving relativistically along their axises is
described by distributions which are finite and infrared stable in low
transverse momentum region. It is argued that there is an exponential
transition to the perturbative regime of large transverse momenta and its power
is defined by the distance between the dipole charges in its rest frame
.Comment: 8 page
Pion condensation of quark matter in the static Einstein universe
In the framework of an extended Nambu--Jona-Lasinio model we are studying
pion condensation in quark matter with an asymmetric isospin composition in a
gravitational field of the static Einstein universe at finite temperature and
chemical potential. This particular choice of the gravitational field
configuration enables us to investigate phase transitions of the system with
exact consideration of the role of this field in the formation of quark and
pion condensates and to point out its influence on the phase portraits. We
demonstrate the effect of oscillations of the thermodynamic quantities as
functions of the curvature and also refer to a certain similarity between the
behavior of these quantities as functions of curvature and finite temperature.
Finally, the role of quantum fluctuations for spontaneous symmetry breaking in
the case of a finite volume of the universe is shortly discussed.Comment: RevTex4; 15 pages, 10 figure
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