نتایج جستجو برای: momentum dispersion
تعداد نتایج: 113225 فیلتر نتایج به سال:
We formulate the massive overlap fermions on anisotropic lattices. We find that the dispersion relation for the overlap fermion resembles the continuum form in the low-momentum region once the bare parameters are properly tuned. The quark selfenergy and the quark field renormalization constants are calculated to one-loop in bare lattice perturbation theory. We argue that massive domain wall qua...
We study the 2-loop resummed propagator in hot g 2 φ 4 theory. The propa-gator has a cut along the whole real axis in the complex energy plane, but for small g, the spectral density is sharply peaked around the plasmon. The dispersion relation and the width of the plasmon are calculated at zero and finite momentum. At large momenta the spectral width vanishes, and the plasmon looses its collect...
We describe some semiclassical spectral properties of Harper-like operators, i. e. of one-dimensional quantum Hamiltonians periodic in both momentum and position. The spectral region corresponding to the separatrices of the classical Hamiltonian is studied for the case of integer flux. We derive asymptotic formula for the dispersion relations, the width of bands and gaps, and show how geometric...
After some brief personal recollections about V.N.Gribov, I demonstrate that his results and ideas on complex angular momenta may be applied in unfamiliar directions. As an example, it is shown, that any strong interaction amplitude, satisfying dispersion relation (in momentum transfer), has infinite number of energy-plane poles, both for exotic and non-exotic quantum numbers. This result ensur...
A possible technique of generation of high-frequency drive beam for a linear collider consists in creating electron bunches in a battery of guns and merging them in a magnetic circuit (switch-yard) at the end of which all the bunches are aligned on a common line with the right spacing. Two types of scheme are discussed. The properties of the structure in terms of orbit dispersion, focusing and ...
Simulation of atmospheric dispersion of radionuclides using an Eulerian-Lagrangian modelling system.
In this paper we present an atmospheric dispersion scenario for a proposed nuclear power plant in Pakistan involving the hypothetical accidental release of radionuclides. For this, a concept involving a Lagrangian stochastic particle model (LSPM) coupled with an Eulerian regional atmospheric modelling system (RAMS) is used. The atmospheric turbulent dispersion of radionuclides (represented by n...
We propose a new approach to unveil the presence of binary intermediate mass black holes (IMBHs) in the core of globular clusters (GCs). We study the signature that a binary IMBH imprints on the velocity and on the angular momentum of cluster stars, simulating 3-body encounters between a star and a binary IMBH. We find that the binary IMBH generates a family of few hundreds of stars (∼ 100-300)...
Using the Feynman path integral method and a theory of polarizable fluids, I evaluate properties of nondegenerate Fröhlich polarons interacting in the strong coupling limit. At large enough densities and temperatures these properties are found to be mainly governed by the dispersion forces, i.e. attractive van-der-Waals interactions, which are no attributed to any permanent electric multipoles....
Large momentum-dependence of the main dispersion ‘kink’ in the high-Tcsuperconductor Bi2Sr2CaCu2O8+δ
We show that a criticism made in hep-ph/0610294 against our paper Mod. Phys. Lett. A21, 1769 (2006) has no ground. We confirm that all results of investigations of the socalled “spin light of neutrino (SLν)” are incorrect because of the medium influence on photon dispersion. With taking account of this influence, both the SLν radiation rate and the total power are zero for neutrinos in all real...
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