In this paper we show that the entropy of a cosmological horizon in topological Reissner-Nordström-de Sitter and Kerr-Newman-de Sitter spaces can be described by the Cardy-Verlinde formula, which is supposed to be an entropy formula of conformal field theory in any number of dimension. Furthermore, we find that the entropy of a black hole horizon can also be rewritten in terms of the Cardy-Verl...

Using gyroscopes we generalize results, obtained for the gravitomagnetic clock effect in the particular case when the exterior spacetime is produced by a rotating dust cylinder, to the case when the vacuum spacetime is described by the general cylindrically symmetric Lewis spacetime. Results are contrasted with those obtained for the Kerr spacetime. ∗Postal address: Apartado 80793, Caracas 1080...

We analyze the asymptotic symmetries of near extremal Kerr black holes in four dimensions using the AdS2/CFT1 correspondence. We find a Virasoro algebra with central charge cR = 12J that is independent from the Virasoro algebra (with the same central charge) that acts on the degenerate ground state. The energy of the excitations is computed as well, and we can use Cardy’s formula to determine t...

he process of localizing digital games can be significantly different from the process of localizing productivity software; although many of the issues can be discussed in similar terms, the game industry carries with it a series of unique challenges. The term digital game itself requires some clarification. Kerr (2002) defines digital games as “games on a number of different digital platforms ...

(1) Ideal general relativistic MHD (ideal GRMHD) simulation: Jet formation by magnetic bridges between the ergosphere and disk around a rapidly black hole: Anti-parallel magnetic field ⇒ Magnetic reconnection (2) GRMHD with finite conductivity (σGRMHD): Numerical method and simple tests

Optically thick films of MnPt 3 were deposited on quartz using dc magnetron sputtering. The films were covered with an SiO x protective overcoat and annealed in vacuum at 850 °C for 1 h to form the crystalline L1 2 ͑Cu 3 Au͒ cubic structure. These films have a high degree of long-range order and are highly textured with the ͑111͒ axis along the film normal. Variable angle spectroscopic ellipsometry...

Propagation of a fermion in curved space-time generates a gravitational interaction due to coupling of its spin with the space-time curvature connection. This gravitational interaction, which is an axialfour-vector multiplied by a four gravitational vector potential, appears as a CPT violating term in the Lagrangian which generates an opposite sign and thus asymmetry between the left-handed and...

The magneto-optical Kerr effect (MOKE) is a widely employed technique for the characterization of ferromagnetic thin films. However, a quantitative analysis is usually hampered by the lacking knowledge of precise magneto-optical parameters. We report the thickness dependence (0–60 nm) of the linear and quadratic MOKE in epitaxial bcc-Fe(001) samples and extract a complete set of parameters for ...

Ultrafast spin dynamics in ferromagnetic half-metallic compound Sr 2 FeMoO 6 is investigated by pump-probe measurements of magneto-optical Kerr effect. Anomalous thermal insulation between spins and electrons due to half-metallic nature of this material gives rise to a very slow spin relaxation from a few to several-hundred picosecond after the optical excitation. The optically detected magneti...

Antoci et al. have argued that the horizons of the boost-rotation, Kerr and Schwarzschild solutions are singular, having shown that a certain invariantly-defined acceleration scalar blows up at the horizons. Their examples do not satisfy the usual definition of a singularity. It is argued that using the same term is seriously misleading and it is shown that such divergent functions are natural ...