Relativistic dynamics of Qqq systems

The bound state of constituent quarks forming a $Qqq$ composite baryon is investigated in a QCD-inspired effective light-front model. The light-front Faddeev equations are derived and solved numerically. The masses of the spin 1/2 low-lying states of the nucleon, $\Lambda^0$, $\Lambda^+_c$ and $\Lambda^0_b$ are found and compared to the experimental data. The data is qualitatively described with a flavor independent effective interaction.Comment: 18 pages, include 6 figures, 2 eps figures, use latex, revtex. To appear Phys. Rev D (2002

Ground State Masses and Biding Energies of the Nucleon, Hyperon and Heavy Baryons in a Light-Front Model

The ground state masses and binding energies of the nucleon, $\Lambda^0$, $\Lambda^+_c$, $\Lambda^0_b$ are studied within a constituent quark QCD-inspired light-front model. The light-front Faddeev equations for the $Qqq$ composite spin 1/2 baryons, are derived and solved numerically. The experimental data for the masses are qualitatively described by a flavor independent effective interaction.Comment: 13 pages, include 4 eps figures, use latex, revte

A cyclic universe with colour fields

The topology of the universe is discussed in relation to the singularity problem. We explore the possibility that the initial state of the universe might have had a structure with 3-Klein bottle topology, which would lead to a model of a nonsingular oscillating (cyclic) universe with a well-defined boundary condition. The same topology is assumed to be intrinsic to the nature of the hypothetical primitive constituents of matter (usually called preons) giving rise to the observed variety of elementary particles. Some phenomenological implications of this approach are also discussed.Comment: 21 pages, 9 figures; v.4: final versio

Ground State Masses and Binding Energies of the Nucleon, Hyperon and Heavy Baryons in a Light-Front Model

The ground state masses and binding energies of the nucleon, Λ 0 , Λ + c , Λ 0 b are studied within a constituent quark QCD-inspired light-front model. The light-front Faddeev equations for the Qqq composite spin 1/2 baryons, are derived and solved numerically. The experimental data for the masses are qualitatively described by a flavor independent effective interaction. I Introduction Modelling the light-front hadron wave-function is a challenge as long as the exact wave-function from Quantum Cromodynamics is not yet avaliable. The wave-function contains physical information complementary to the spectrum. At scales below 1 GeV, the wave-function is described by effective degrees of freedom, and the lowest Fock-state component of the light-front hadron wave function is composed by the minimal number of constituent quarks necessary to give the quantum numbers. Within this general framework, a light-front QCD-inspired model was recently applied to the pion and other mesons Here, we follow closely the work of Ref. [3] and revise the extension of the concepts coming from the effective QCD-model, applied to mesons . We use a flavor independent effective interaction between the constituent quarks, a property necessary to describe the masses of these baryon