43193585
Chiral current at high temperatures.
The BPFTW effective action is a good laboratory to study the nature of chiral symmetry at high [ital T]. It is invariant under a new Noether charge [ital Q][sub 5][sup [beta]]. By explicit quantization, performed to order [ital T][prime], we show that the thermal vacuum is annihilated by [ital Q][sub 5][sup [beta]], so that the new chiral symmetry is not broken spontaneously at high [ital T]. This high [ital T] Noether charge is, however, different from the usual zero temperature chirality [ital Q][sub 5]. Our quantization also shows that the thermal vacuum is not annihilated by [ital Q][sub 5], so that the old chiral symmetry remains broken at high [ital T]. The thermal vacuum is thus every bit as structured'' and complex'' as the Nambu--Jona-Lasinio vacuum at zero temperature. We exhibit the relation between the normal mode expansion for [ital Q][sub 5][sup [beta]] versus the usual expansion for [ital Q][sub 5]. In an appendix, we point out the analyticity properties of the fermion propagator in the real time formalism, and verify the canonical nature of the thermal Green function.
29537174
Interacting string field theory and Chern-Simons form.
We propose a new gauge-invariant action for an interacting open-string field theory based on an analogy with the Chern-Simons form. We also discuss the Becchi-Rouet-Stora-Tyutin quantization of this action.
120226155
Impact parameters: A geometrical picture of inelastic scattering
Abstract The constraints on the impact-parameter description of arbitrary n -body scattering due to the Lorentz group are shown to take a simple form at very high energies. The produced jet of beam fragmentation products, each with b i , and x i , will be centered about the impact parameter b of the incident beam. A geometrical language can be introduced for the description of inelastic scattering and a simple model is proposed based on this picture. The single-fragmentation inclusive cross section is shown to rise as log s if the total cross section rises as log-squared. In a bremsstrahlung-type model, it is shown that an energy-dependent eikonal of the Cheng-Wu type can be compatible with the apparently linear fit to the Wroblewski plot.
121599412
Decoupling renormalization and hierarchies
We introduce the decoupling renormalization scheme for the one-particle irreducible Green's functions of a theory that has a mass hierarchy. The decoupling-subtraction renormalization-group equations respect a tree-level hierarchy. Thus, fine tuning is to be done only at the tree level.
18392660
Chirality in the Early Universe
The early big bang is an alphabet soup of quarks, W bosons, gluons, and other exotic particles and flavors. In the usual scenario, there is no place for the pion. It dissociates in the alphabet soup of the early universe. I will show that this scenario is naive. The thermal vacuum is a far more complex state, and the pion remains a Nambu-Goldstone particle at high $T$, and will not dissociate. It propagates at the speed of light but {\em with a halo}.
119847840
Linear Regge trajectories for the psion family and O(4) dynamics
The newly discovered psion family can be described by mass-squared linear Regge trajectories. The new J/subP//subC/ assignments are for 2.8 GeV/ c$sup 2$, 0$sup ++$, and for the 3.4 region, 2$sup ++$, 1$sup -+$, 0$sup ++$. All radiative decays are related through a single S/sub mu//sub nu/F/sub mu//sub nu/ coupling. A good fit is obtained. (AIP)
20487228
Theory of magnon-hole interaction for the anisotropic t-J model.
The general Holstein-Primakoff transformation is used to get a theory of the magnon-hole interaction for the anisotropic t-J model in a three-dimensional tetragonal lattice. The sublattice magnetization, internal energy, and specific heat are calculated by taking into account the contributions of magnon-magnon, magnon-hole, and hole-hole as well as antiferromagnetic spin polaron interactions. We obtain a uniform expression for these quantities, which is governed by the concentration of doping and the anisotropic degree. The results show that the effect of the small interlayer coupling in a layered realistic copper-oxide superconductors turns indeed the temperature dependence of the physical quantities from two-dimensional to quasi-two-dimensional behavior at low temperature.
25715346
Dynamics of generalized photonic fields interacting with atoms.
We generalize the electromagnetic mode to be dependent on the deformation parameter and investigate the dynamics of the generalized photonic fields that possess quantum group symmetry interacting with atoms. Radiative decays and line shifts of an excited atom are obtained in this system. When an atom is in an intense field, the time development operator, intensity operator, and the time variation of the photon distribution are given in an explict way both with and without intensity-dependent coupling. The results of Chaichian, Ellinas, and Kulish [Phys. Rev. Lett. 65, 980 (1990)] are recovered in case of resonance. We also discuss the dynamics of the coupled N-atom system in detail.
11075073
Generalized Jaynes-Cummings model with an intensity-dependent coupling interacting with a quantum group-theoretic coherent state.
We present a generalized Jaynes-Cummings model (JCM) with an intensity-dependent coupling interacting with a quantum group-theoretic coherent state. The field operators of the JCM Hamiltonian are identified as the elements of the su(q)(1,1) quantum algebra in their Holstein-Primakoff realizations. We lay emphasis on the time evolution of field quadruatures and atomic population inversion of the generalized JCM. The revivals of radiation squeezing are obtained for any values of initial squeezing.
38291756
Quantum critical phenomena and conformal invariance.