1,046 research outputs found
Long-distance behavior of color dependent potentials at finite temperature
SU(3) heavy quark potentials at finite temperature are studied with quenched
lattice QCD using the stochastic gauge-fixing method. In addition to the
standard color average channel, we investigate potentials in singlet
and octet channels. % We obtain clear signals in all cases. The singlet
channel yields an attractive force, while the octet
potential is repulsive; the corresponding color average channel also results in
an attractive force. %As the temperature increases, these forces are weakened
and As the temperature increases, these forces become weak and their variations
are very small; at , % the singlet attractive force is not so
weakened even for long distances. the singlet attractive force survives over . The singlet and octet potentials calculated with this algorithm have
a small gauge dependence when the gauge parameter is changed from 0.6
to 1.3.Comment: 12 pages, 9 figures, typos corrected, to appear in Prog. Theor. Phy
Finite-Width Bundle is Most Stable in a Solution with Salt
We applied the mean-field approach to a columnar bundle assembled by the
parallel arrangement of stiff polyelectrolyte rods in a salt bath. The
electrostatic potential can be divided into two regions: inside the bundle for
condensed counter-ions, and outside the bundle for free small ions. To
determine the distribution of condensed counter-ions inside the bundle, we use
a local self-consistent condition that depends on the charge density, the
electrostatic potential, and the net polarization. The results showed that,
upon bundle formation, the electric charge of polyelectrolytes, even those
inside the bundle, tend to survive in an inhomogeneous manner, and thus their
width remains finite under thermal equilibrium because of the long-range effect
of charge instability.Comment: 7 pages, 4 figure
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