We discuss three modes of oscillation of accretion disks around rotating magnetized neutron stars which may explain the separations of the kilo-Hertz -periodic oscillations (QPO) seen in low mass Xray binaries. The existence of these compressible, non-barotropic magnetohydrodynamic (MHD) modes requires that there be a maximum in the angular velocity Ωφ(r) of the accreting material larger than t...

Abstract The fundamental properties for the spin and orbital angular momentum are analyzed using acoustic evanescent Bessel beams. calculations reveal that transversal spin, canonical momentum, proportional to ratio l /ω where is topological charge ω frequency. This analysis shows complex Poynting vector density exhibits interesting features related electromagnetic case.

Numerical solutions are presented for a family of three dimensional periodic orbits with three equal masses which connects the classical circular orbit of Lagrange with the recently discovered planar figure eight orbit with zero total angular momentum [1],[2]. Each member of this family is an orbit with finite angular momentum that is periodic in a frame which rotates with frequency Ω around th...

In the post-Newtonian (PN) regime, the time scale on which the spins of binary black holes precess is much shorter than the radiation-reaction time scale on which the black holes inspiral to smaller separations. On the precession time scale, the angle between the total and orbital angular momenta oscillates with nutation period τ, during which the orbital angular momentum precesses about the to...

We found that the two–dimensional Schrödinger equation for 3 electrons in an homogeneous magnetic field (perpendicular to the plane) and a parabolic scalar confinement potential (frequency ω 0) has exact analytical solutions in the limit, where the expectation value of the center of mass vector R is small compared with the average distance between the electrons. These analytical solutions exist...

in exploration seismology quality factor is widely used as a seismic attribute to identify anomalies related to attenuation, especially those caused by hydrocarbon. previous studies have indicated that seismic energy loss known as attenuation is greater for high frequency components of seismic data compared to the low frequency components. here the continuous wavelet transform is used to study ...

MREPT: An overview •Magnetic Resonance Electrical Property Tomography (MREPT) aims to visualize both conductivity σ and permittivity ǫ distributions at the Larmor frequency (≈ 128 MHz for a 3 T MRI). • In MREPT, we feed an ac current at the Larmor frequency through a coil located outside of the imaging object Ω. In Ω, the injected current will induce a magnetic field H = (Hx Hy Hz). For r = (x,...

When a symmetric top is set spinning with angular velocity ω c about its own axis, it traces out a circle about a vertical direction with angular velocity ω z , as shown in Fig. 1. In most textbooks [1, 2, 3] the precessional angular velocity ω z is calculated under the assumption that it is much smaller than the spin angular velocity ω c . This makes for a simplification of the calculation by ...

We compute classical gravitational bremsstrahlung from the gravitational scattering of two massless particles at leading order in the (center of mass) deflection angle θ ∼ 4G √ s/b = 8GE/b ≪ 1. The calculation, although non-perturbative in the gravitational constant, is surprisingly simple and yields explicit formulae –in terms of multidimensional integrals– for the frequency and angular distri...

The dynamics of tilted vortex lines in Josephson-coupled layered superconductors is considered within the time-dependent Ginzburg-Landau theory. The frequency and angular dependences of the complex-valued vortex mobility μ are studied. The components of the viscosity and inertial mass tensors are found to increase essentially for magnetic field orientations close to the layers. For superconduct...