49,335 research outputs found
Infrared regulators and SCETII
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
Includes bibliographical references
QPROP: A Schroedinger-solver for intense laser-atom interaction
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
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Aristelliger barbouri
Number of Pages: 1Integrative BiologyGeological Science
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Thecadactylus, T. rapicauda
Number of Pages: 16Integrative BiologyGeological Science
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Aristelliger georgeensis
Number of Pages: 2Integrative BiologyGeological Science
Critical temperature and Ginzburg region near a quantum critical point in two-dimensional metals
We compute the transition temperature and the Ginzburg temperature
above 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 and as a function of the non-thermal control
parameter for the quantum phase transition, including logarithmic corrections.
The Ginzburg regime between and occupies a sizable part of
the phase diagram.Comment: 5 pages, 1 figur
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