Singularity dynamics: Action and ReactionThe interaction between singular and regular fields is considered for Lorentz-invariant scalar and vector wave equations. The singular field is generated by a Dirac source term. Its dynamics are…Michael Mazilu·Jun 29, 2005SaveLearn
The gauge non-invariance of Classical Electromagnetism"Physical theories of fundamental significance tend to be gauge theories. These are theories in which the physical system being dealt with is described by more variables than there are physically…Germain Rousseaux·Jun 28, 2005SaveLearn
An Optimal Angle of Launching a Point Mass in a Medium with Quadratic Drag ForceA classic problem of the motion of a point mass (projectile) thrown at an angle to the horizon is reviewed. The air drag force is taken into account with the drag factor assumed to be constant.…Peter Chudinov·Jun 28, 2005SaveLearn
Darwin-Lagrangian Analysis for the Interaction of a Point Charge and a Magnet: Considerations Related to the Controversy Regarding the Aharonov-Bohm and Aharonov-Casher Phase ShiftsThe classical electromagnetic interaction of a point charge and a magnet is discussed by first calculating the interaction of point charge with a simple model magnetic moment and then suggesting a…Timothy H. Boyer·Jun 23, 2005SaveLearn
The Paradoxical Forces for the Classical Electromagnetic Lag Associated with the Aharonov-Bohm Phase ShiftThe classical electromagnetic lag assocated with the Aharonov-Bohm phase shift is obtained by using a Darwin-Lagrangian analysis similar to that given by Coleman and Van Vleck to identify the…Timothy H. Boyer·Jun 23, 2005SaveLearn
The way back: from charge conservation to Maxwell equationsThe main purpose of this article is to disseminate among a wide audience of physicists a known result, which is available since a couple of years to the cognoscenti of differential forms on…F. De Zela·Jun 22, 2005SaveLearn
Recent Experimental Tests of Special RelativityWe review our recent Michelson-Morley (MM) and Kennedy-Thorndike (KT) experiment, which tests Lorentz invariance in the photon sector, and report first results of our ongoing atomic clock test of…Peter Wolf, Sebastien Bize, Michael E. Tobar et al.·Jun 21, 2005SaveLearn
Remarks on the conservation of mechanical energy in introductory mechanicsWe discuss the work-kinetic energy theorem and the mechanical energy conservation theorem in the context of general physics courses. The motivation is the fact that all modern texts on introductory…F C Santos, V Soares, A C Tort·Jun 18, 2005SaveLearn
Memory Functions of the Additive Markov chains: Applications to Complex Dynamic SystemsA new approach to describing correlation properties of complex dynamic systems with long-range memory based on a concept of additive Markov chains (Phys. Rev. E 68, 061107 (2003)) is developed. An…S. S. Melnyk, O. V. Usatenko, V. A. Yampol'skii·Jun 17, 2005SaveLearn
Lienard-Wiechert solution revisitedA self-consistent consideration of the Lienard-Wiechert solition is given including its heuristic deduction, which involves a future light cone (thus the lightlike propagation of information from an…Nikolai V. Mitskievich·Jun 16, 2005SaveLearn
On electromagnetic boundary conditions and constitution of homogeneous materialsConstitutive scalars that are absent in the fundamental differential equations of frequency-domain electromagnetism on the two sides of a boundary between two homogeneous mediums are shown to…Akhlesh Lakhtakia·Jun 15, 2005SaveLearn
H-theorem for classical matter around a black holeWe propose a classical solution for the kinetic description of matter falling into a black hole, which permits to evaluate both the kinetic entropy and the entropy production rate of classical…Piero Nicolini, Massimo Tessarotto·Jun 15, 2005SaveLearn
Indoor Sonic Boom Reproduction Using ANCThe European programs for development of supersonic air-flights involve new studies on the human perception of sonic boom. Because this noise includes high-level components at very low-frequency, the…Nicolas Epain, Emmanuel Friot, Guy Rabau·Jun 14, 2005SaveLearn
Synchronization of organ pipes: experimental observations and modelingWe report measurements on the synchronization properties of organ pipes. First, we investigate influence of an external acoustical signal from a loudspeaker on the sound of an organ pipe. Second, the…M. Abel, S. Bergweiler, R. Gerhard-Multhaupt·Jun 10, 2005SaveLearn
Cherenkov Radiation from e+e- Pairs and Its Effect on νe Induced ShowersWe calculate the Cherenkov radiation from an e+e- pair at small separations, as occurs shortly after a pair conversion. The radiation is reduced (compared to that from two independent particles)…Sourav K. Mandal, Spencer R. Klein, J. David Jackson·Jun 8, 2005SaveLearn
Dynamics of a bouncing dimerWe investigate the dynamics of a dimer bouncing on a vertically oscillated plate. The dimer, composed of two spheres rigidly connected by a light rod, exhibits several modes depending on initial and…S. Dorbolo, D. Volfson, L. Tsimring et al.·Jun 7, 2005SaveLearn
How an antenna launches its input power into radiation: the pattern of the Poynting vector at and near an antennaIn this paper I first address the question of whether the seat of the power radiated by an antenna made of conducting members is distributed over the ``arms'' of the antenna according to -J .…J. David Jackson·Jun 6, 2005SaveLearn
An Ignored Mechanism for the Longitudinal Recoil Force in Railguns and Revitalization of the Riemann Force LawThe electric induction force due to a time-varying current is used to account for the longitudinal recoil force exerted on the rails of railgun accelerators. As observed in the experiments, this…Ching-Chuan Su·Jun 6, 2005SaveLearn
Complex Relativity: Gravity and Electromagnetic FieldsWe present new aspects of the electromagnetic field by introducting the natural potentials. These natural potentials are suitable for constructing the first order distortions of the metric tensor of…Roman Teisseyre, Mariusz Bialecki·Jun 6, 2005SaveLearn
The Projectile inside the LoopIn this paper we describe an alternative use of the loop-the-loop apparatus, which can be used to study an interesting case of projectile motion. We also present an effective way to perform and…Gabriele U. Varieschi·Jun 6, 2005SaveLearn
Precision test for the new Michelson-Morley experiments with rotating cryogenic cavitiesA new ether-drift experiment in Düsseldorf is currently measuring the relative frequency shift of two cryogenic optical resonators upon active rotations of the apparatus. I point out that the…M. Consoli·Jun 1, 2005SaveLearn
How do clarinet players adjust the resonances of their vocal tracts for different playing effectsIn a simple model, the reed of the clarinet is mechanically loaded by the series combination of the acoustical impedances of the instrument itself and of the player's vocal tract. Here we measure…Claudia Fritz, Joe Wolfe·May 27, 2005SaveLearn
QuasiresonanceThe concept of quasiresonance was introduced in connection with inelastic collisions between one atom and a vibro-rotationally excited diatomic molecule. In its original form, the collisions induce…Antonia Ruiz, Eric J. Heller·May 19, 2005SaveLearn
Torsional waves in a bowed stringBowing a string with a non-zero radius exerts a torque, which excites torsional waves. In general, torsional standing waves have higher fundamental frequencies than do transverse standing waves, and…Eric Bavu, John Smith, Joe Wolfe·May 9, 2005SaveLearn
Rotationnal and translational waves in a bowed stringWe measure and compare the rotational and transverse velocity of a bowed string. When bowed by an experienced player, the torsional motion is phase-locked to the transverse waves, producing highly…Eric Bavu, Manfred Yew, Pierre-Yves Placais et al.·May 9, 2005SaveLearn