Search results for "Physics::General Physics"

showing 3 items of 63 documents

Generalized parton distributions and constituent quarks

2002

An approach is described to calculate Generalized Parton Distributions (GPDs) in Constituent Quark Models (CQM). The GPDs are obtained from wave functions to be evaluated in a given CQM. The general relations linking the twist-two GPDs to the form factors and to the leading twist quark densities are recovered. Results for the leading twist, unpolarized GPD in the Isgur and Karl model are presented.

QuarkPhysicsNuclear and High Energy PhysicsParticle physicsPhysics::General PhysicsHigh Energy Physics::LatticeHigh Energy Physics::PhenomenologyConstituent quarkFOS: Physical sciencesFísicaPartonHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)TwistWave functionNuclear Experiment
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Conjugate times for smooth singular trajectories and bang-bang extremals

2003

Abstract In this paper we discuss the problem of estimating conjugate times along smooth singular or bang-bang extremals. For smooth extremals conjugate times can be defined in the generic case by using the intrinsic second order derivative or the exponential mapping. An algorithm is given which was implemented in the SR-case to compute the caustic [1] or in recent applied problems [5],[9]. We investigate briefly the problem of using this algorithm in the bang-bang case by smoothing the corners of extremals

[ MATH.MATH-OC ] Mathematics [math]/Optimization and Control [math.OC]0209 industrial biotechnologyPhysics::General Physics010102 general mathematicsMathematical analysis[MATH.MATH-OC] Mathematics [math]/Optimization and Control [math.OC]02 engineering and technology01 natural sciences020901 industrial engineering & automationExponential mappingCaustic (optics)[MATH.MATH-OC]Mathematics [math]/Optimization and Control [math.OC]0101 mathematicsBang bangBang–bang controlSmoothingMathematicsConjugateSecond derivative
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Rich clusters from SDSS DR8

2012

The study of the properties of galaxy clusters and their environment gives us information about the formation and evolution of galaxies, groups and clusters, and larger structures - superclusters of galaxies and the whole cosmic web. We study the relations between the multimodality of galaxy clusters drawn from the SDSS DR8 and the environment where they reside. As cluster environment we consider the global luminosity density field, supercluster membership, and supercluster morphology.

observational astronomyPhysics::General Physicsgalactic and extragalactic astronomyAstrophysics and AstronomyPhysicsGalaxy clustersAstrophysics::Cosmology and Extragalactic AstrophysicsCatalogsGalaxiesNatural SciencesPhysics::History of PhysicsAstrophysics::Galaxy Astrophysics
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