3,284 research outputs found
Color Confinement and Massive Gluons
Color confinement is one of the central issues in QCD so that there are
various interpretations of this feature. In this paper we have adopted the
interpretation that colored particles are not subject to observation just
because colored states are unphysical in the sense of Eq. (2.16). It is shown
that there are two phases in QCD distinguished by different choices of the
gauge parameter. In one phase, called the "confinement phase", color
confinement is realized and gluons turn out to be massive. In the other phase,
called the "deconfinement phase", color confinement is not realized, but the
gluons remain massless.Comment: 14 page
Noncommutative Quantum Field Theory: A Confrontation of Symmetries
The concept of a noncommutative field is formulated based on the interplay
between twisted Poincar\'e symmetry and residual symmetry of the Lorentz group.
Various general dynamical results supporting this construction, such as the
light-wedge causality condition and the integrability condition for
Tomonaga-Schwinger equation, are presented. Based on this analysis, the claim
of the identity between commutative QFT and noncommutative QFT with twisted
Poincar\'e symmetry is refuted.Comment: 20 page
A simulation of high energy cosmic ray propagation 1
High energy cosmic ray propagation of the energy region 10 to the 14.5 power - 10 to the 18th power eV is simulated in the inter steller circumstances. In conclusion, the diffusion process by turbulent magnetic fields is classified into several regions by ratio of the gyro-radius and the scale of turbulence. When the ratio becomes larger then 10 to the minus 0.5 power, the analysis with the assumption of point scattering can be applied with the mean free path E sup 2. However, when the ratio is smaller than 10 to the minus 0.5 power, we need a more complicated analysis or simulation. Assuming the turbulence scale of magnetic fields of the Galaxy is 10-30pc and the mean magnetic field strength is 3 micro gauss, the energy of cosmic ray with that gyro-radius is about 10 to the 16.5 power eV
Renormalization Constant of the Color Gauge Field as a Probe of Confinement
The mechanism of color confinement as a consequence of an unbroken
non-abelian gauge symmetry and asymptotic freedom is elucidated and compared
with that of other models based on an analogy with the type II superconductor.
It is demonstrated that a sufficient condition for color confinement is given
by where denotes the renormalization constant of the color
gauge field. It is shown that this condition is actually satisfied in quantum
chromodynamics and that some of the characteristic features of other models
follow from it.Comment: 34 pages, Latex, v2 - 2 appendices adde
An Interpretation of Noncommutative Field Theory in Terms of a Quantum Shift
Noncommutative coordinates are decomposed into a sum of geometrical ones and
a universal quantum shift operator. With the help of this operator, the mapping
of a commutative field theory into a noncommutative field theory (NCFT) is
introduced. A general measure for the Lorentz-invariance violation in NCFT is
also derived.Comment: 16 page
Gamma rays of energy or = 10(15) eV from Cyg X-3
The experimental data of extensive air showers observed at Akeno have been analyzed to detect the gamma ray signal from Cyg X-3. After muon poor air showers are selected, the correlation of data acquisition time with 4.8 hours X-ray period is studied, giving the data concentration near the phase 0.6, the time of X-ray maximum. The probability that uniform backgrounds create the distribution is 0.2%. The time averaged integral gamma ray flux is estimated as (1.1 + or - 0.4)x 10 to the -14th power cm(-2) sec(-1) for Eo 10 to the 15th power eV and (8.8 + or - 5.0)x 10 to the 14th power cm(-2) sec(-1) for Eo 6 x 10 to the 14th power eV
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