1550-7998=20 We consider the asymptotic quasinormal frequencies of various spin fields in Schwarzschild and Reissner-Nordström black holes. In the Schwarzschild case, the real part of the asymptotic frequency is ln3 for the spin 0 and the spin 2 fields, while for the spin 1=2, the spin 1, and the spin 3=2 fields it is zero. For the nonextreme charged black holes, the spin 3=2 Rarita-Schwinger f...

Free current operators are constructed for massive particles with arbitrary spin j. Such current operators are related to representations of the U(N,N) type groups and are covariant under the (extended) Poincaré group and charge conjugation, where the charge conjugation operation is defined as an automorphism on U(N,N) elements. The currents are also required to satisfy current conservation, he...

We study a fermionic infinited-ranged Ising spin glass with a real space BCS interaction in the presence of an applied transverse field. The problem is formulated in the integral functional formalism where the SU(2) spins are given in terms of bilinear combinations of Grassmann fields. The problem is solved within static approximation and the replica symmetry ansatz combined with previous appro...

The spin structure functions g 1 and g 2 have been calculated in the resonance region and for small and intermediate momentum transfer. The calculation is based on a gauge-invariant and unitary model for one-pion photo-and electroproduction. The predictions of the model agree with the asymmetries and the spin sturcture functions recently measured at SLAC, and the first moments of the calculated...

A variation to the usual formulation of Grassmann representation path integrals is presented. Time-indexed anticommuting partners are introduced for each Grassmann coherent state variable and a general method for handling the effect of these introduced Grassmann partners is also developed. These Grassmann partners carry the nilpotency and anticommutivity of the Grassmann coherent state variable...

Two discrete path integral formulations for the ground state of a spinpinned quantum anisotropic XXZ Heisenberg chain are introduced. Their properties are discussed and two recursion relations are proved. Departamento de Fisica-Matematica, Universidade de Sao Paulo, Sao Paulo 05315-970 Brazil Dipartimento di Matematica, Università di Bologna, 40127 Bologna, Italy Department of Mathematics, Univ...

The ESA γ-ray telescope, INTEGRAL, is detecting relatively more intrinsically rare cataclysmic variables (CVs) than were found by surveys at lower energies. Specifically, a large fraction of the CVs that are INTEGRAL sources consists of asynchronous polars and intermediate polars (IPs). IP classifications have been proposed for the majority of CVs discovered by INTEGRAL, but, in many cases, the...