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2013-05-22
04:19
Rotation of Plasma Layers with Various Densities in Crossed ExB Fields / V., Kovtun Yu ; I., Skibenko E ; I., Skibenko A ; B, Yuferov V
The rotational velocity of plasma layers with various densities in a pulsed reflex-discharge plasma is studied with the use of the two-frequency microwave fluctuation reflectometry. The difference between the angular rotational velocities of plasma layers with different densities is revealed, and their time dependences are determined. [...]
arXiv:1305.4928.- 2013 - 8 p. - Published in : Ukrainian Journal of Physics: 58 (2013) , pp. 450-457 External link: Preprint

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2013-05-22
04:19
Atomic scale friction of molecular adsorbates during diffusion / Lechner, B A J ; de Wijn, A S ; Hedgeland, H ; Jardine, A P ; Hinch, B J ; Allison, W ; Ellis, J
Experimental observations suggest that molecular adsorbates exhibit a larger friction coefficient than atomic species of comparable mass, yet the origin of this increased friction is not well understood. We present a study of the microscopic origins of friction experienced by molecular adsorbates during surface diffusion. [...]
arXiv:1305.4864.- 2013 - Published in : J. Chem. Phys. 8 (2013) 194710 External link: Preprint

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2013-05-22
04:19
Self-potentials in partially saturated media: the importance of explicit modeling of electrode effects / Jougnot, D ; Linde, N
Self-potential (SP) data are of interest to vadose zone hydrology because of their direct sensitivity to water flow and ionic transport. There is unfortunately little consensus in the literature about how to best model SP data under partially saturated conditions and different approaches (often supported by one laboratory data set alone) have been proposed. [...]
arXiv:1305.4856.- 2013 External link: Preprint

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2013-05-22
04:19
On the Dirac Monopole Mass Scale / Caruso, Francisco
It is shown, by a semi-classical argument, that the Dirac charge quantization is still valid in the (classical) Born-Infeld electromagnetic theory. Then it is possible to calculate Dirac's monopole mass in the framework of this theory, which is not possible in Maxwell's theory. [...]
arXiv:1305.4810.- 2013 - 4 p. External link: Preprint

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2013-05-22
04:19
Ultracold collision in the presence of synthetic spin-orbit coupling / Duan, Hao ; You, Li ; Gao, Bo
We present an analytic description of ultracold collision between two spin-$\frac{1}{2}$ fermions with isotropic spin-orbit coupling of the Rashba type. We show that regardless of how weak the spin-orbit coupling may be, the ultracold collision at sufficiently low energies is significantly modified, including the ubiquitous Wigner threshold behavior. [...]
arXiv:1305.4750.- 2013 - Published in : Phys. Rev. A 87 (2013) 052708 External link: Preprint

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2013-05-22
04:18
Classical and Quantum Discrete Dynamical Systems / Kornyak, Vladimir V
We study deterministic and quantum dynamics from a constructive "finite" point of view, since the introduction of a continuum, or other actual infinities in physics poses serious conceptual and technical difficulties, without any need for these concepts to physics as an empirical science. For a consistent description of the symmetries of dynamical systems at different times and the symmetries of the various parts of such systems, we introduce discrete analogs of the gauge connections. [...]
arXiv:1208.5734.- 2013 - 74 p. - Published in : Phys. Part. Nucl. ISSN: 036 (2013) , pp. 44 External link: Preprint

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2013-05-22
04:14
Scalar Field Perturbations with Arbitrary Potentials in Quantum Backgrounds / Falciano, F T ; Pinto-Neto, Nelson ; Vitenti, Sandro Dias Pinto
In this paper it is shown how to obtain, without ever using the background classical equations of motion, a simple second order Hamiltonian involving the Mukhanov-Sasaki variable describing quantum linear scalar perturbations for the case of scalar fields with arbitrary potentials and arbitrary spacelike hyper-surfaces. It is a generalization of previous works, where the scalar field potential was absent and the spacelike hypersurfaces were flat. [...]
arXiv:1305.4664.- 2013 - 9 p. - Published in : Phys. Rev. D 87 (2013) 103514 External link: Preprint

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2013-05-22
04:14
Gravitational-thermodynamic instabilities of isothermal spheres in dS and AdS / Roupas, Zacharias
Thermodynamical stability of fluid spheres is studied in the presence of a cosmological constant, both in the Newtonian limit, as well as in General Relativity. In all cases, an increase of the cosmological constant tends to stabilize the system, making asymptotically de Sitter space more thermodynamically stable than anti-de Sitter at the purely classical level. [...]
arXiv:1305.4851.- 2013 External link: Preprint

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2013-05-22
04:14
Feasibility of utilizing Cherenkov Telescope Array gamma-ray telescopes as free-space optical communication ground stations / Carrasco-Casado, Alberto ; Vilera, Mariafernanda ; Vergaz, Ricardo ; Cabrero, Juan Francisco
The signals that will be received on Earth from deep-space probes in future implementations of free-space optical communication will be extremely weak, and new ground stations will have to be developed in order to support these links. This paper addresses the feasibility of using the technology developed in the gamma-ray telescopes that will make up the Cherenkov Telescope Array (CTA) observatory in the implementation of a new kind of ground station. [...]
arXiv:1305.4753.- 2013 - Published in : Issue: 11 (2013) , pp. 2353-2362 External link: Preprint

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2013-05-22
04:14
Estimation of Lateral Distribution Function in Extensive Air Showers by Using AIRES Simulation System / Ahmed, Al-Rubaiee A ; Jumaah, Ahmed
In this work the estimation of the lateral distribution function in Extensive Air showers was performed by using a system for air shower simulations which is called AIRES version 2.6 for different hadronic models like (QGSJET99, SIBYLL and SIBYLL1.6). The simulation was fulfilled in the high energy range (10^15-10^19 eV) for different primary particles like (gamma, protons and iron nuclei) for vertical showers. [...]
arXiv:1305.4628.- 2013 - 6 p. External link: Preprint

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