48,356 research outputs found

    Infrared regulators and SCETII

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    We consider matching from SCETI, which includes ultrasoft and collinear particles, onto SCETII with soft and collinear particles at one loop. Keeping the external fermions off their mass shell does not regulate all IR divergences in both theories. We give a new prescription to regulate infrared divergences in SCET. Using this regulator, we show that soft and collinear modes in SCETII are sufficient to reproduce all the infrared divergences of SCETI. We explain the relationship between IR regulators and an additional mode proposed for SCETII.Comment: 9 pages. Added discussion about relationship between IR regulators and messenger mode

    Role expectation process in building a desirable work culture

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    Includes bibliographical references

    QPROP: A Schroedinger-solver for intense laser-atom interaction

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    The Qprop package is presented. Qprop has been developed to study laser-atom interaction in the nonperturbative regime where nonlinear phenomena such as above-threshold ionization, high order harmonic generation, and dynamic stabilization are known to occur. In the nonrelativistic regime and within the single active electron approximation, these phenomena can be studied with Qprop in the most rigorous way by solving the time-dependent Schr\"odinger equation in three spatial dimensions. Because Qprop is optimized for the study of quantum systems that are spherically symmetric in their initial, unperturbed configuration, all wavefunctions are expanded in spherical harmonics. Time-propagation of the wavefunctions is performed using a split-operator approach. Photoelectron spectra are calculated employing a window-operator technique. Besides the solution of the time-dependent Schr\"odinger equation in single active electron approximation, Qprop allows to study many-electron systems via the solution of the time-dependent Kohn-Sham equations.Comment: 40 pages, LaTeX; to obtain the QPROP source code visit http://www.qprop.de, accepted for publication in Computer Physics Communication

    Critical temperature and Ginzburg region near a quantum critical point in two-dimensional metals

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    We compute the transition temperature TcT_c and the Ginzburg temperature TGT_{\rm G} above TcT_c near a quantum critical point at the boundary of an ordered phase with a broken discrete symmetry in a two-dimensional metallic electron system. Our calculation is based on a renormalization group analysis of the Hertz action with a scalar order parameter. We provide analytic expressions for TcT_c and TGT_{\rm G} as a function of the non-thermal control parameter for the quantum phase transition, including logarithmic corrections. The Ginzburg regime between TcT_c and TGT_{\rm G} occupies a sizable part of the phase diagram.Comment: 5 pages, 1 figur
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