47 research outputs found

    SUq(2)SU_q(2) Lattice Gauge Theory

    Get PDF
    We reformulate the Hamiltonian approach to lattice gauge theories such that, at the classical level, the gauge group does not act canonically, but instead as a Poisson-Lie group. At the quantum level, it then gets promoted to a quantum group gauge symmetry. The theory depends on two parameters - the deformation parameter λ\lambda and the lattice spacing aa. We show that the system of Kogut and Susskind is recovered when λ0\lambda \rightarrow 0, while QCD is recovered in the continuum limit (for any λ\lambda). We thus have the possibility of having a two parameter regularization of QCD.Comment: 26 pages, LATEX fil

    Deceleration and trapping of heavy diatomic molecules using a ring-decelerator

    Full text link
    We present an analysis of the deceleration and trapping of heavy diatomic molecules in low-field seeking states by a moving electric potential. This moving potential is created by a 'ring-decelerator', which consists of a series of ring-shaped electrodes to which oscillating high voltages are applied. Particle trajectory simulations have been used to analyze the deceleration and trapping efficiency for a group of molecules that is of special interest for precision measurements of fundamental discrete symmetries. For the typical case of the SrF molecule in the (N,M) = (2, 0) state, the ring-decelerator is shown to outperform traditional and alternate-gradient Stark decelerators by at least an order of magnitude. If further cooled by a stage of laser cooling, the decelerated molecules allow for a sensitivity gain in a parity violation measurement, compared to a cryogenic molecular beam experiment, of almost two orders of magnitude

    Electric field study with HIBP in OH and ECRH plasmas on the T-10 tokamak

    No full text
    The plasma potential φ and radial electric field Er were studied on T-10 in a wide range of ohmic and ECRH regimes. At densities ne> 10¹⁹ m⁻³, the potential has negative sign over the whole plasma cross section. At lower densities, the outer zone with positive φ and Er is formed. The absolute value of potential at mid-radius grows with density up to ne ≈ 3×10¹⁹ m⁻³ and then saturates. In regimes with ECR heating, |φ| decreases owing to the density pump-out and the electron temperature increase. Measurements of Er are compared with numerical simulations with several codes including nonambipolar fluxes due to the toroidal field ripple. The change of radially averaged ¬Er with density and temperature qualitatively agrees with neoclassical expectations.Потенциал плазмы φ и радиальное электрическое поле Er исследовались на токамаке T-10 в широком диапазоне омических и ЭЦР-режимов. При плотностях ne> 10¹⁹ м⁻³ потенциал имеет положительный знак во всем сечении плазмы. При меньших плотностях во внешней зоне потенциал и Er меняют знак. Абсолютное значение потенциала на середине радиуса растет с плотностью вплоть до ne ≈ 3×10¹⁹ м⁻³, а затем насыщается. В режимах с ЭЦР-нагревом абсолютная величина |φ| уменьшается за счет откачки плотности и роста электронной температуры. Измерения Er сравнивались с численными расчетами по нескольким кодам, учитывающим неамбиполярные потоки за счет гофрировки тороидального поля. Изменение среднего поля ¬Er с плотностью и температурой не противоречит неоклассическим ожиданиям.Потенціал плазми φ та радіальне електричне поле Er було досліджено на токамаці Т-10 у широкому діапазоні омічних та ЕЦР-режимів. При щiльностях ne> 10¹⁹ м⁻³ потенцiал має позитивний знак в усьому перетинi плазми. При менших щiльностях у зовнiшнiй зонi потенціал та Er змiнюють знак. Абсолютне значення потенцiалу на серединi радіуса росте зi щiльністью майже до ne ≈ 3×10¹⁹ м⁻³, а потiм насичується. У режимах з ЕЦР-нагрiвом абсолютна величина |φ|зменшується за рахунок відкачки щiльностi та росту електронноï температури. Вимiрювання Er порiвнювалися з числовими розрахунками за декiлькома кодами, які враховують неамбіполярнi потоки за рахунок гофрировки тороïдального поля. Зміна середнього поля ¬Er з щiльнiстю та температурою не протирiчить неокласичним сподiванням

    Infinite (continuous) spin particle in constant curvature space

    No full text
    We present a new particle model that generalize for constant curvature space an infinite spin particle in flat space. The model is described by commuting Weyl spinor additional coordinates. It proved that such a model is consistent only in external gravitational field corresponding to the constant curvature spaces. Full set of the first-class constraints in the de Sitter and anti-de Sitter spaces is obtained
    corecore