11,235 research outputs found

    Chiral Symmetry Breaking in a Soft-Wall Model of AdS/QCD

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    We incorporate chiral symmetry breaking in a soft-wall version of the AdS/QCD model by using a modified dilaton profile and a quartic term in the bulk scalar potential. This allows one to separate the dependence on spontaneous and explicit chiral symmetry breaking. The resulting mass spectra in the scalar, vector and axial-vector sectors compares favorably with the respective QCD resonances.Comment: Proceedings of "Crossing the Boundaries: Gauge Dynamics at Strong Coupling", Minneapolis, 2009. 12 pages, 7 figure

    Dynamic service-based integration of mobile clusters in grids

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    February 2008 and is reprinted here with permission. The report is available on the CoreGRID website, at

    Time-dependent density functional theory on a lattice

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    A time-dependent density functional theory (TDDFT) for a quantum many-body system on a lattice is formulated rigorously. We prove the uniqueness of the density-to-potential mapping and demonstrate that a given density is vv-representable if the initial many-body state and the density satisfy certain well defined conditions. In particular, we show that for a system evolving from its ground state any density with a continuous second time derivative is vv-representable and therefore the lattice TDDFT is guaranteed to exist. The TDDFT existence and uniqueness theorem is valid for any connected lattice, independently of its size, geometry and/or spatial dimensionality. The general statements of the existence theorem are illustrated on a pedagogical exactly solvable example which displays all details and subtleties of the proof in a transparent form. In conclusion we briefly discuss remaining open problems and directions for a future research.Comment: 12 pages, 1 figur
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