27606969
Signature for chiral-symmetry breaking at high temperatures.
In this paper we study the temperature dependence of chiral-symmetry breaking. Our real-time calculation shows that the thermal fermion propagator has a Lorentz-invariant massive particle pole even as {l angle}vac{vert bar}{bar {psi}}{psi}{vert bar}vac{r angle}{sub {beta}} vanishes for {ital T}{gt}{Lambda}{sub {ital c}e}{sup 2/3}. The traditional signature of chiral-symmetry breaking is found only after transforming the Dirac field to the new chiral basis at high temperatures.
124646114
WHAT IF THE HIGGS HAS BROTHERS
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}.
121345541
Instantons with fractional topological charge
Abstract We introduce and discuss the properties of multivalent gauges for Yang-Mills fields, and demonstrate the existence of instantons with fractional topological charges in such gauges.
123020230
New Renormalization Program for Broken Gauge Theories
We derive a new renormalization-group theorem which expressly relates the parameters of the symmetric high-energy theory to the parameters of the broken, low-energy theory. The relation is an analytic one. It summarizes the threshold effects by leapfrogging across each threshold and provides a connection formula. The relation is derived for an arbitrary group hierarchy structure.
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.
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.
38291756
Quantum critical phenomena and conformal invariance.
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.