We perform cosmological, hydrodynamic simulations of magnetic elds in galaxy clusters. The computational code combines the special-purpose hardware Grape for calculating gravitational interaction, and smooth-particle hydrodynamics for the gas component. We employ the usual MHD equations for the evolution of the magnetic eld in an ideally conducting plasma. As a rst application, we focus on the ...

The generation of magnetic elds by a battery, operating in an ion-electron plasma around a Kerr black hole, is studied in the 3+1 split of the Kerr metric. It is found that the gravitomagnetic contributions to the electron partial pressure are able to drive currents. The strength of the equilibrium magnetic eld should be higher than for the classical Biermann battery, which is found to operate ...

3 S u m m a r y : We present simulations of the 3D nonlinear induction equation in order to investigate the temporal evolution of large-scale magnetic elds in spiral galaxies. Our model includes diierential rotation, ambipolar diiusion and, based on small-scale turbulence, eddy diiusivity and the tensorial-eeect with magnetic feedback. The nonax-isymmetric spiral pattern and { if considered { t...

We have studied time-resolved photoluminescence (PL) from negatively-charged excitons (Xÿ) in GaAs quantum wells at high magnetic ®elds. The PL decay time of Xÿ showed large increase in magnetic ®elds perpendicular to the well layers. This results from a reduction of coherence volume when the translational motion of charged Xÿ is con®ned by cyclotron orbit. In contrast, no such increase was see...

The presumed diiculty of computing discrete logarithms in nite elds is the basis of several popular public key cryptosystems. The secure identiication option of the Sun Network File System, for example, uses discrete logarithms in a eld GF(p) with p a prime of 192 bits. This paper describes an implementation of a discrete logarithm algorithm which shows that primes of under 200 bits, such as th...

virial theorem is important for understanding stellar structures. it produces an interesting connection between magnetic and gravitational energies. using the general form of the virial theorem including the magnetic field (toroidal magnetic field), we may explain the solar dynamo model in relation to variations of the magnetic and gravitational energies. we emphasize the role of the gravitatio...

Phase III upgrade of CESR includes super conducting magnets without iron. The magnets are built from super conducting wire loops wrapped on a pipe. Because of the high currents involved in super conducting magnets, the distortion of the magnetic elds at the rounded ends may not be negligible and should be calculated. The gradual decrease in the magnetic eld at the edges causes higher order mult...

AB S TRACT Large-scale magnetic ®elds are believed to play an important role in the radiative zone of the Sun, in particular in the dynamical processes in the transition region between the convective and radiative zones (the tachocline). Also, they are probably responsible for the observed uniform rotation of the radiative zone. In that respect, since it has been suggested that the solar dynamo...

We reanalyze the e ect of magnetic elds in BBN, incorporating several features which were omitted in previous analyses. We nd that the e ects of coherent magnetic elds on the weak interaction rates and the electron thermodynamic functions ( e, Pe, and d e=dT ) are unimportant in comparison to the contribution of the magnetic eld energy density in BBN. In consequence the e ect of including magne...

Virial theorem is important for understanding stellar structures. It produces an interesting connection between magnetic and gravitational energies. Using the general form of the virial theorem including the magnetic field (toroidal magnetic field), we may explain the solar dynamo model in relation to variations of the magnetic and gravitational energies. We emphasize the role of the gravitatio...