123170513
Color-Magnetic Permeability of QCD Vacuum
In a preYious papern we have shown that the true ground-state yacuum of QCD (quantum chromodynamics) has lower energy than the "perturbative vacuum." The MIT bag constant may be given by the energy density difference between the perturbative vacuum and the true ground-state vacuum of QCD, because in the MIT bag model the perturbative vacuum is used inside the bag, while on the outside we have for the fields an impenetrable vacuum. In the present paper we calculate the color-magnetic permeability lie of the QCD true vacuum and show this value to be 1/2 within the quark-one-loop approximation. A gl uon-loop contribution to the QCD vacuum is shown to be neglected when the number of quark flavor is large. If lie= 0, the vacuum is the perfect diamagnet so that quarks and gluons may be confined inside Abrikosov flux lines by the Meissner effect. However, m view of our result fie= 1/2 this confinement is still imperfect at this stage. We begin with a review of our previous work. We adopt the following expression of the SU (2) background gauge field:
9105602
Charged superstrings in background gauge fields and spectrum-generating algebra
The spectrum-generating algebra (SGA) for charged superstrings placed in constant background magnetic fields is constructed. Contrary to the neutral string this algebra is characteristic of including the cyclotron frequency. The Regge intercept and superconformal anomalies are calculated to be shifted by the cyclotron frequency and Dbrane parameters from the conventional values.
122480764
Supergauge Algebra and Electromagnetic Interaction of the Dual Pion Model. II
We consider the electromagnetic problems of the dual pion model proposed by Neveu and Schwarz. The photon gauge substitution and the supergauge algebra appearing in this model are shown to determine the interaction uniquely. Consequently we find that (i) the electric charge has only two localization points which are at the ends of the string and that (ii) new gauge conditions hold, which are crucial for proving the no-ghost theorem in our t)leory. We also give a proof of the photon-gauge invariance of our system and find (iii) the conserved dual current. Unfortunately we are forced to stay in the on-shell world (i.e., massless photon).
121930670
Supergauge Algebra and Interaction between Open and Closed Strings
In the Neveu-Schwarz and Ramond models we construct the vertices which describe the emission of closed-string ground-state particles out of open string states. The modified supergauge algebra associated with the new vertices can be shown to hold in the same form as the usual supergauge algebra in free cases. and is crucial for proving the no-ghost theorem in our system.
123479897
Exact Solutions to Mean-Field Equations in Lattice Gauge Theories
122739517
Electromagnetic Properties of the Kaluza-Klein String
On calcule le g-facteur magnetique pour la corde dans la theorie de Kaluza-Klein de l'espace-temps a 5 dimensions et on trouve une formule generale des moments magnetiques avec le g-facteur universel de g(J)=1 pour tous les etats de corde
122430943
Spectroscopy of Nuclei Approaching the Proton Drip-line Using a Secondary-fragmentation Technique with the RISING Detector Array
An experiment utilizing a double fragmentation reaction was performed to study isobaric analogue states in A similar to 50 nuclei approaching the proton drip-line. gamma-ray spectroscopy will be used to identify excited states in the neutron-deficient nuclei produced in the second fragmentation reaction. Excited state level schemes will be obtained, through comparison with states in their well-known mirror partners, along with information on Coulomb effects through measurements of the Coulomb energy differences between isobaric analogue excited states. The validity of isospin symmetry for nuclei approaching the proton drip-line can also be investigated and the information gained will aid in testing and improving fp shell model calculations. The analysis of the collected data is at a preliminary stage and current status of this work is reported.