776 research outputs found
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Fractional quantum Hall effect in nonuniform magnetic fields.
Investigations of the fractional quantum Hall effect are extended to spatially varying magnetic fields. Approximate single-particle wave functions are proposed and compared with ones obtained by numerical integration. As in the uniform field case, the interacting many-electron system forms an incompressible fluid and has fractionally charged excitations. Field inhomogeneities can trap collective excitations. © 1990 The American Physical Society
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Peccei-Quinn mechanism and dimension-six CP-violating operators.
It is shown that the Peccei-Quinn mechanism will, in the large-N limit, remove dimension-six CP-violating operators constructed solely out of gauge fields. Such operators have been recently proposed as a source of a possibly large neutron electric dipole moment. © 1991 The American Physical Society
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Corrections to the Thomas-Fermi model of the atom
A WKB approximation to the Hartree equations for an atom, taking the 1 r singularity of the potential into account, is developed. This in turn allows us to obtain in a systematic way the Z -1 3 and Z -2 3 corrections to the Thomas-Fermi model of the atom. Such a procedure is used to obtain a finite change density at the nucleus, which agrees well with Hartree-Fock values. © 1982
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Scaling, light-cone expansion, and the Van Hove model
With certain assumptions on the coupling of two currents to particles of increasing spin, it is shown that the Van Hove model results in Bjorken scaling and Regge asymptotic behavior. The fields corresponding to these particles are related to the products appearing in the operator-product expansion near the light cone. © 1971 The American Physical Society
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Recent high-energy multiplicity distributions in the context of the Feynman fluid analogy
Recent accelerator data on multiplicity distributions are reexamined within the context of the Feynman fluid analogy. An interpretation of the data put forward is that the diffractive component decreases logarithmically with energy. © 1973 The American Physical Society
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Multiple vacua for non-abelian lattice gauge theories
The various formulations of gauge theories characterized by the parameter θ are constructed for the lattice version of these theories. We do not rely on the existence of topologically stable solutions of the classical equations. These constructions are based on the existence of inequivalent representations of the canonical commutation relations. © 1979
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Isospin mixing in charmonium states
The "molecular" charmonium models predict both I = 0 and I = 1 states. The closeness of one of these (4.028 GeV) to one of its main thresholds and the large electromagnetic mass splitting of its daughters may induce a large mixing between states of different isospin. This would manifest itself in deviations from unity of the ratio of charged to neutral decay modes. © 1977 The American Physical Society
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Quark spin content of vector mesons.
dominance of form factors of the topological QCD current leads to an expression for the portion of the spin of the light vector mesons that is due to quarks. Vector dominance of the radiative decays of the is used to estimate the couplings of this meson to the vector ones. This results in the conclusion that only around 30% of the spin of these particles is due to quarks. Possible interpretations of this result are presented. © 1991 The American Physical Society
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Low-energy neutron-neutron scattering parameters
A precise evaluation of the spectrum in the reaction π-+D→2n+γ, including final-state interactions is presented with a view of determining the neutron-neutron scattering length. Approximations of previous calculations are examined and avoided where their effect is found to be significant. Sufficiently accurate experiments should be capable of distinguishing this parameter to an error of 1 F. © 1964 The American Physical Society
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