共查询到20条相似文献,搜索用时 31 毫秒
1.
J. L. Hernández–Pastora O. V. Manko V. S. Manko J. Martín E. Ruiz 《General Relativity and Gravitation》2004,36(4):781-797
The extended quadruple–Kerr metric is used to consider equilibrium states of four collinear Kerr particles. We explain our previous failure to solve numerically the full set of the balance equations, and we derive a self–consistent system of the axis conditions leading to the equilibrium of all four constituents which can be black holes or hyperextreme objects. The equilibrium configurations obtained in this paper exhibit similar features with those occurring in the systems of two Kerr particles, for instance, the balance of four Kerr black holes with positive masses does not seem possible. Equilibrium states of two identical compound Kerr objects are also discussed. 相似文献
2.
A theory of the polar magneto-optical Kerr effect in a layer of small ferromagnetic particles has been developed in the framework
of the Green’s function method of electrodynamics. The manifestation in magneto-optics of the local field effect, which is
initiated by the contribution to the effective field of dipole moments induced in particles, has been studied in terms of
the model of a square lattice of ferromagnetic ellipsoids. The magneto-optical Kerr effect stimulated under normal incidence
of a linearly polarized electromagnetic wave on a layer of particles magnetized perpendicular to the layer plane has been
analyzed. The dependence of the Kerr rotation angle in an array of ellipsoidal Co particles embedded in the transparent dielectric
CaF2 on the light frequency, the parameters of the ellipsoidal particles, and the lattice period (concentration of the magnet
in the layer) has been studied numerically. It has been shown that, within a broad (2.0–4.5 eV) spectral range, the local
field effect studied as a function of increasing concentration of Co particles in the layer manifests itself in the reversal
of the sign of the Kerr rotation compared to that observed in a single ellipsoid or a solid Co film. 相似文献
3.
In this paper, we extend Parikh’s (massless particles) and Zhang’ work to massive particles’ Kerr black hole tunnelling. By treating the massive particle as de Broglie wave, we calculate the emission rates of the particles across the event horizon of the Kerr black holes. Our result is successful and is in agreement with the form of the massless particles. 相似文献
4.
The techniques of second quantization in Kerr metric for the scalar and neutrino (massless) fields are extended to the massive
spin half case. The normal modes of Dirac field in Kerr metric are obtained in Chandrasekhar’s representation and the field
is quantized as usual by imposing equal-time anti-commutation relations. The vacuum expectation value of energy-momentum tensor
is evaluated asymptotically, leading to the result that a Kerr black hole spontaneously creates, in addition to scalar and
neutrino quanta, massive Dirac particles in the classical superradiant modes. 相似文献
5.
In this paper the repulsive effects in the Kerr and Kerr--Newman fields are
discussed. The contributions made by all parameters of the fields and test
particles to the repulsive effects are also discussed, and the accretive
effect on interstellar dust, i.e. the distribution of dust is calculated.
The discussion is also carried out on the slow rotation of the Kerr field in
which the effect is related to the positions and velocities of the particles
and the orientations of their trajectories as well. 相似文献
6.
Planckian scattering of particles with angular momenta is studied by describing them as sources of the Kerr metric. In the shock wave formalism, it is found that the angular momenta do not contribute to the scattering amplitude in the eikonal limit. This is confirmed by using the wave equation of the test particle in the Kerr background. 相似文献
7.
Helmut Fuchs 《Annalen der Physik》1983,495(1):47-50
We derive a class of exact solutions of Mathisson-Papapetrou equations of motion for spinning test particles. The world lines of the particles are those of the so-called locally non-rotating observers in Kerr spacetime. 相似文献
8.
Mark Davidson 《Foundations of Physics》2018,48(11):1590-1616
Complexified Liénard–Wiechert potentials simplify the mathematics of Kerr–Newman particles. Here we constrain them by fiat to move along Bohmian trajectories to see if anything interesting occurs, as their equations of motion are not known. A covariant theory due to Stueckelberg is used. This paper deviates from the traditional Bohmian interpretation of quantum mechanics since the electromagnetic interactions of Kerr–Newman particles are dictated by general relativity. A Gaussian wave function is used to produce the Bohmian trajectories, which are found to be multi-valued. A generalized analytic continuation is introduced which leads to an infinite number of trajectories. These include the entire set of Bohmian trajectories. This leads to multiple retarded times which come into play in complex space-time. If one weights these trajectories by their natural Bohmian weighting factors, then it is found that the particles do not radiate, that they are extended, and that they can have a finite electrostatic self energy, thus avoiding the usual divergence of the charged point particle. This effort does not in any way criticize or downplay the traditional Bohmian interpretation which does not assume the standard electromagnetic coupling to charged particles, but it suggests that a hybridization of Kerr–Newman particle theory with Bohmian mechanics might lead to interesting new physics, and maybe even the possibility of emergent quantum mechanics. 相似文献
9.
Siegfried Hess 《Optics Communications》1975,15(2):139-142
The anisotropy of the velocity distribution caused by an electric current in a fluid leads to a molecular alignment via the non-spherical interaction. This alignment implies a birefringence proportional to the square of the applied electric field just as the ordinary Kerr effect. The kinetic theory of this phenomenon is presented for a lorentzian mixture, viz. a gas of few light charged linear molecules and of many heavy optically isotropic particles. The current-induced contribution to the Kerr effect turns out to be much larger than the contribution which stems from the usually considered orienting influence of the electric field on anisotropic molecules. 相似文献
10.
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12.
M. Ghanassi L. Piveteau L. Saviot M. C. Schanne-Klein D. Ricard C. Flytzanis 《Applied physics. B, Lasers and optics》1995,61(1):17-26
After having reported preliminary results related to saturation, we first theoretically consider the various mechanisms contributing to the resonant optical Kerr effect in Cd(S, Se)-doped glasses. We obtain the expression for the expected effective susceptibility in different possible cases. This nonlinearity is studied experimentally using optical-phase conjugation in the low-intensity regime. We show that, by time resolving the nonlinear response of such glasses having experienced various degrees of photodarkening, we can clearly assess the origin of the resonant optical Kerr effect in these materials. Usually, a combination of a fast free-carrier contribution due to particles without traps and of a slow trapped-carrier one due to particles with traps is observed. For the free-carrier contribution, induced absorption is observed to be almost as important as absorption saturation. We also report frequency-dependent measurements and discuss the change in absorption spectrum and the increase of the nonradiative decay rate that accompany darkening. 相似文献
13.
The Hawking effect of Dirac particles in a variable-mass Kerr space-time is investigated by using a method called as the generalized tortoise coordinate transformation. The location and the temperature of the event horizon of the non-stationary Kerr black hole are derived. It is shown that the temperature and the shape of the event horizon depend not only on the time but also on the angle. However, the Fermi–Dirac spectrum displays a residual term which is absent from that of Bose–Einstein distribution. 相似文献
14.
Romeric Pobre 《Optics Communications》2006,267(2):295-304
We calculate the radiation force that is exerted by a focused continuous-wave Gaussian beam of wavelength λ on a non-absorbing nonlinear particle of radius a ? 50λ/π. The refractive index of the mechanically-rigid particle is proportional to the incident intensity according to the electro-optic Kerr effect. The force consists of two components representing the contributions of the electromagnetic field gradient and the light scattered by the Kerr particle. The focused intensity distribution is determined using expressions for the six electromagnetic components that are corrected to the fifth order in the numerical aperture (NA) of the focusing objective lens. We found that for particles with a < λ/21.28, the trapping force is dominated by the gradient force and the axial trapping force is symmetric about the geometrical focus. The two contributions are comparable with larger particles and the axial trapping force becomes asymmetric with its zero location displaced away from the focus and towards the beam propagation direction. We study the trapping force behavior versus incident beam power, NA, λ, and relative refractive index between the surrounding liquid and the particle. We also examine the confinement of a Kerr particle that exhibits Brownian motion in a focused beam. Numerical results show that the Kerr effect increases the trapping force strength and significantly improves the confinement of Brownian particles. 相似文献
15.
The nonthermal radiation of a Kerr black hole is considered as the tunneling of particles being produced through an effective Dirac gap. In the leading semiclassical approximation, this approach is also applicable to bosons. Our semiclassical results for photons and gravitons are consistent with those obtained previously. For neutrinos, the result of our complete quantum-mechanical calculation is about twice as large as the previous one. 相似文献
16.
Wenbiao Han 《General Relativity and Gravitation》2008,40(9):1831-1847
We study chaos dynamics of spinning particles in Kerr spacetime of rotating black holes use the Papapetrou equations by numerical
integration. Because of spin, this system exists many chaos solutions, and exhibits some exceptional dynamic character. We
investigate the relations between the orbits chaos and the spin magnitude S, pericenter, polar angle and Kerr rotation parameter a by means of a kind of brand new Fast Lyapulov Indicator (FLI) which is defined in general relativity. The classical definition
of Lyapulov exponent (LE) perhaps fails in curve spacetime. And we emphasize that the Poincaré sections cannot be used to
detect chaos for this case. Via calculations, some new interesting conclusions are found: though chaos is easier to emerge
with bigger S, but not always depends on S monotonically; the Kerr parameter a has a contrary action on the chaos occurrence. Furthermore, the spin of particles can destroy the symmetry of the orbits
about the equatorial plane. And for some special initial conditions, the orbits have equilibrium points. 相似文献
17.
Baocheng Zhang Qing-yu Cai Ming-sheng Zhan 《The European Physical Journal C - Particles and Fields》2010,68(3-4):561-566
By calculating the change of entropy, we prove that the first law of black hole thermodynamics leads to the tunneling probability of massive particles through the horizon, including the tunneling probability of massive charged particles from the Reissner–Nordström black hole and the Kerr–Newman black hole. Novelly, we find the trajectories of massive particles are close to that of massless particles near the horizon, although the trajectories of massive charged particles may be affected by electromagnetic forces. We show that Hawking radiation as massive particles tunneling does not lead to violation of the weak cosmic-censorship conjecture. 相似文献
18.
Mark Davidson 《General Relativity and Gravitation》2012,44(11):2939-2964
A hypothetical equation of motion is proposed for Kerr–Newman particles. It’s obtained by analytic continuation of the Lorentz-Dirac equation into complex space-time. A new class of “runaway” solutions are found which are similar to zitterbewegung. Electromagnetic fields generated by these motions are studied, and it’s found that the retarded (and advanced) times are multi-sheeted functions of the field points. This leads to non-uniqueness for the fields. With fixed weighting factors for these multiple roots, the solutions radiate. However, position dependent weighting factors can suppress radiation and allow non-radiating solutions. Motion with external forces are also considered, and radiation suppression is possible there too. These results are relevant for the idea that Kerr–Newman solutions provide insight into elementary particles and into emergent quantum mechanics. They illustrate a type of nascent wave-particle duality and complementarity in a purely classical field theory. Metric curvature due to gravitation is ignored. 相似文献
19.
Antonio Zecca 《International Journal of Theoretical Physics》1995,34(7):1083-1091
A straightforward calculation shows that, in contrast to what happens for the Dirac equation in the Kerr metric, the net current of particles is not conserved in the case of the Dirac equation in the Tolman-Bondi and Robertson-Walker space-times. 相似文献
20.
Charged particle orbits off the equatorial plane of a Kerr black hole in an external electromagnetic field is studied, both
for dipole as well as uniform magnetic field. Particles are found to get trapped by the magnetic field if the initial value
of the parallel velocity is small. Bending of the field lines in the vicinity of the hole and the consequent trapping of the
particles in an otherwise uniform magnetic field indicates the significance of general relativistic effects in such cases. 相似文献