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Showing 1 to 20 of 71 for “"propagator"”.
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The propagator for graviton modes in supergravity on ADS5 x S5
The propagator for k ≥ 0 Kaluza-Klein modes of the graviton in supergravity (SUGRA) on AdS5 X S5 is calculated in part. This propagator could be useful in calculations of four-leg scattering amplitudes as a further test of the proposed holographic duality between SUGRA on AdSd and the conformal …
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Two-loop corrections to the rho-propagator in the Kroll-Lee-Zumino theory
… we perform a two-loop calculation of the rho-propagator. This quantity is closely related to the pion’s electromagnetic form factor, and will allow its calculation at this order.
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Rho-Meson propagator at two-loop order in the Kroll-Lee-Zumino quantum field theory
The Kroll-Lee-Zumino theory, an Abelian renormalizable quantum field theory of charged pions and a neutral ρ meson, provides a framework to compute corrections to the tree-level Vector-Meson-Dominance model. Despite a large ρππ coupling (gρππ ≈ 5), the loop suppresion factor of 1=(4π)² helps give …
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Gluon propagator in classical color field of colliding hadrons and its implications for hadronic cross sections
… the colliding nucleons, and show how the gluon propagator is modified. The corresponding gauge invariance condition of the propagator is derived and shown to be satisfied. The modified gluon propagator leads to a suppression of the minijet cross section due to the gg [rightwards arrow] gg …
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Interpretation of shear wave birefringence in P to S converted waves data using the propagator matrix method
… We solve the transmission problem using the propagator matrix method. The importance of this method is that it does not require information about layering above the zone of interest and is accurate for estimating the anisotropy parameters. The method involves solving a non-linear problem in …
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Quantum Mechanical Calculations of Time Correlation Functions for Neat Fluids
… using the pair-product approximation to the propagator is also discussed. Using single-step approximations to the propagator, it is shown that real-time correlation functions can be expressed as integrals of smooth functions, and thus can be efficiently evaluated by Monte Carlo methods. Tests …
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Quark and Gluon Propagation in Two-Colour Quantum Chromodynamics at Finite Density
… and chromomagnetic components of the gluon propagator have been calculated and their response to varying temperatures and chemical potentials are studied. The form factors of the normal and anomalous quark propagator are presented and their behaviour with respect to changing chemical …
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Path-integral analysis of passive, graded-index waveguides applicable to integrated optics
… simulations. Closed form expressions for the propagator and the coupling efficiency of symmetrically tapered graded-index waveguide sections are presented in this thesis for the first time. The tapered waveguide geometries considered are the general power-law geometry, the linear, parabolic, …
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Semiklassische Beschreibung des Spin-Boson-Modells
… the <br>endpoints. The resulting semiclassical propagator is shown to coincide <br>with the exact quantum mechanical propagator. A non-linear <br>transformation of the angle variables allows for a <br>determination of the semiclassical path and the jumps without solving <br>a boundary-value …
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From local and bulk structure-flow correlations to macro-scale transport properties with MRI: applications using deformable porous media and deep learning
… by conducting non-spatially resolved NMR propagator experiments. It was found that dispersion increased with decreasing permeability and that it almost doubled with strain due to long-range heterogeneities. Macro-scale heterogeneities introduced by differential compaction were examined …
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Feynman Diagram Models of Daughter Regge Trajectories
… scattering. Both the simple model with bare propagators and a generalized model that includes propagator self-energy insertions are considered. It is found that, in the simple model, the second boson daughter and the first fermion daughter are fixed (as a function of the squared momentum …
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The Collisional Evolution of Orbital Debris in Geopotential Wells and Disposal Orbits
… orbits effected by the geopotential wells. A propagator is developed for the accurate simulation of GEO specific orbits and the required perturbations are determined and described. Collisions are then simulated in the selected regimes using a low velocity breakup model derived from the NASA …
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Semiklassische Dynamik in starken Laserfeldern
Es werden mit einem semiklassischen Propagator in Anfangswertdarstellung <br>Multiphotonprozesse in starken Laserfelden gerechnet. Mit demselben Verfahren <br>wird die semiklassische Propagation eines Wellenpakets im dreidimensionalen <br>Coulomb-Potential untersucht. Mittels der semiklassischen …
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A continuum path integral approach to the simulation of a unitary gas
… an exact novel zero-range, delta function pair propagator which has been tuned to the unitary limit so that essentially all interactions amongst the interacting particles are comprised of s-wave interactions. This tuning in some sense yields the simplest imaginable interacting fermionic system …
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Semiclassical Propagators for Quantum Coherent States and Applications of Extra Quantum Phase to Large-spin Tunneling of Magnetic Molecules
… obtain the semiclassical expressions of quantum propagators by means of coherent states in the holomorphic representation together with the appropriate boundary conditions. It allows us to express the total actions including boundary terms, classical trajectories, and extra phases in the …
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Constructing provenance-aware distributed systems with data propagation
… transformation may be applied to existing propagator networks to allow for the maintenance of data provenance. I show that the modular structure of data propagation permits the simple modification of a propagator network design to maintain the histories of data.
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Fluctuation conductivity from charge density waves in pseudo-one-dimensional systems
… the formulation of the Fröhlich collective mode propagator, approximations to which are examined for deficiencies. An approximation to the propagator is used to calculate diagrammatically the paraconductivity. An attempt is made to resolve disagreement in the literature regarding this …
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Static and dynamic properties of the pion from continuum modelling of strong QCD
… numerical solutions for the quark propagator Schwinger-Dyson equation (SDE) and pseudoscalar meson Bethe-Salpeter equation (BSE) at and beyond the rainbow-ladder truncation level of this system of equations. We solve this coupled system of integral equations using a phenomenological …
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An integral equation for the anomalous deuteron vertex and a comparison of two normalization conditions
… In the second part a proof is given that the propagator normalization of a scalar or a vector particle is equivalent to the normalization of its electromagnetic form fqctoro The basis for the proof is the Ward identityo This permits a direct comparison of the two normalization conditions and …
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Higher order and CP-violating effects in the neutralino and Higgs boson sectors of the MSSM
… contributions are combined with two-loop Higgs propagator-type corrections to obtain the most precise prediction currently available for this class of processes. In the CP-violating CPX benchmark scenario, the corrections to the neutralino decay width are found to be particularly large – of …
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