422 research outputs found
Application of Non-Perturbative Renormalization Group to Nambu-Jona-Lasinio/Gross-Neveu model at Finite Temperature and Chemical Potential
The chiral phase structure of the Nambu-Jona-Lasinio/Gross-Neveu model at
finite temperature T and finite chemical potential \mu is investigated using
(Wilsonian) Non-Perturbative Renormalization Group (NPRG). In the large N_c
limit, the solutions of NPRG with various cutoff schemes are shown. For a
sufficiently large ultra-violet cutoff, NPRG results coincide with those of
Schwinger-Dyson equation and have little cutoff scheme dependence. Next, to
improve the approximation, we incorporate the mesonic fluctuations. We
introduce the auxiliary fields for mesons, and then derive NPRG equation for
finite N_c. The chiral phase structure on (T,\mu) plane beyond the leading of
1/N_c expansion is investigated in the sharp cutoff limit. N_c dependence of
chiral phase diagram is obtained.Comment: 21 pages, 10 epsf figures, to be published in Progress of Theoretical
Physic
Inter-meson Potentials in Dual Ginzburg-Landau Theory
We calculate inter-meson potentials numerically by solving classical
equations of motion derived from Dual Ginzburg-Landau (DGL) Theory. Inter-meson
potentials in DGL theory are shown to be similar to those of the string-flip
model and well reproduce behaviors of the short-range interaction at the
classical level. We also compare our results with those from lattice QCD Monte
carlo calculations.Comment: 18 pages, latex, 8 figure
Trans-Bilayer Ion Conduction by Proline Containing Cyclic Hexapeptides and Effects of Amino Acid Substitutions on Ion Conducting Properties
Several ion channel forming cyclic peptides have been reported over the past two decades and various ion conducting mechanisms have been proposed. In this article, we report on amino acid substitutions in cyclic hexapeptides and their effects on the ion conducting properties of these peptides. Cyclic hexapeptides, cyclo(Pro-Xxx-Yyy)2, containing two Pro residues, were used as the main framework. The substitution is performed at the Xxx positions with cationic/hydrophilic Lys or hydrophobic Leu. Yyy positions were substituted with D-Phe, D-Ala, or Gly. The peptides which were absent Lys residues showed ion conducting profiles with clear transitions of electric currents, whereas the peptides containing Lys residues tended to exhibit spiky or burst-like profiles. These profiles were altered single state profiles by the protection of ε-amino groups with aromatic protecting groups. The protected analogs exhibited significant decrease in ion conductance. These results indicated that peptides containing Lys conduct ions without forming ring stacked tube-like structure. Ion channel properties were also affected by conformational changes of the cyclic peptides induced by substitution of the Yyy positions. Enhancement of intramolecular β-turn structures of cyclic peptides tended to decrease their ion conductance values
Redshift-space Distortions of the Power Spectrum of Cosmological Objects on a Light Cone : Explicit Formulations and Theoretical Implications
We examine the effects of the linear and the cosmological redshift-space
distortions on the power spectrum of cosmological objects on a light cone. We
develop theoretical formulae for the power spectrum in linear theory of density
perturbations in a rigorous manner starting from first principle corresponding
to Fourier analysis. Approximate formulae, which are useful properly to
incorporate the redshift-space distortion effects into the power spectrum are
derived, and the validity is examined. Applying our formulae to galaxy and
quasar samples which roughly match the SDSS survey, we will show how the
redshift-space distortions distort the power spectrum on the light cone
quantitatively.Comment: 30 pages, Accepted for publication in the Astrophysical Journal
Supplement Serie
The investigation of back-transformation mechanisms of ringwoodite and majorite in the Yamato 75267 H6
The Tenth Symposium on Polar Science/Special session: [OA] Antarctic meteorites, Thur. 5 Dec. / 3F Multipurpose conference room, National Institute of Polar Researc
Recent topics of infrared effective lattice QCD
Three topics concerning infrared effective lattice QCD are discussed.
(1)Perfect lattice action of infrared SU(3) QCD and perfect operators for the
static potential are analytically given when we assume two-point monopole
interactions alone. The assumption seems to be justified from numerical
analyses of pure SU(3) QCD in maximally abelian gauge. (2)Gauge invariance of
monopole dominance can be proved theoretically if the gauge invariance of
abelian dominance is proved. The gauge invariance of monopole condensation
leads us to confinement of abelian neutral but color octet states after abelian
projection. (3)A stochastic gauge fixing method is developed to study the gauge
dependence of the Abelian projection, which interpolates between the maximally
abelian (MA) gauge and no gauge fixing. Abelian dominance for the heavy quark
potential holds even in the gauge which is far from Maximally Abelian one.Comment: LATTICE99(Poster),3 pages, LaTeX with 4 eps figure
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