Results 1 - 10 of 4844
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[en] The formula for the number of parameters of an instanton of a given Pontrygen index for all simple Lie groups is derived by a simple method. The derivation is based on a physical interpretation of the degrees of freedom. (author)
[en] The possibility of self-consistently determining instanton liquid parameters with optimal pseudoparticle configurations is discussed. The estimate of repulsive pseudoparticle-interaction weakening is obtained. A comparison of different ensembles of pseudoparticles is made.
[en] We estimate the splitting between the spatial correlation lengths in the scalar and pseudoscalar channels in QCD at high temperature. The splitting is due to the contribution of the instanton/anti-instanton chains in the thermal ensemble, even though instanton contributions to thermodynamic quantities are suppressed. The splitting vanishes at asymptotically high temperatures as ΔM/M∝(ΛQCD/T)b, where b is the beta function coefficient.
[en] The analysis of the instanton contribution for the CP1-model with periodic boundary conditions is performed using isospin invariance. An interpretation in terms of a neutral Coulomb gas is given
[en] This is a survey article on instantons and monopoles and is intended for those who have no prior knowledge of Yang-Mills gauge field theories. With a minimal amount of physical motivation and mathematical apparatus, the basic field equations and their solutions, wherever known, are presented. Particular emphasis is put on those problems which are as yet unsolved. (orig.)
[en] Using Klein's quartic Γ(7) and the number of instantons in Kaehler's K 3, we give an accurate estimation for the possible number of Higgs' particles which we could expect to discover experimentally
[en] We review recent progress in determining the effects of D-brane instantons in N=1 supersymmetric compactifications of Type II string theory to four dimensions. We describe the abstract D-brane instanton calculus for holomorphic couplings such as the superpotential, the gauge kinetic function and higher fermionic F-terms. This includes a discussion of multi-instanton effects and the implications of background fluxes for the instanton sector. Our presentation also highlights, but is not restricted to the computation of D-brane instanton effects in quiver gauge theories on D-branes at singularities. We then summarize the concrete consequences of stringy D-brane instantons for the construction of semi-realistic models of particle physics or SUSY-breaking in compact and non-compact geometries.
[en] The possibility of forming bound states in quark-quark and quark-antiquark systems due to an effective interaction generated by instanton: anti-instanton configurations is studied. It is shown that such states: bare mesons and diquarks: do actually appear inside the hadron as bubbles of size of the order of the instanton radius. The masses of the scalar and pseudoscalar bare mesons and diquarks are calculated. The scalar diquark proves to be the lightest