arXiv subjects

D. V. Redzic

Publications and source records attributed to D. V. Redzic.

3 recordsLinked to original sources

arXiv2015

Subtleties of the clock retardation

For a simple electromagnetic model of a clock introduced by Jefimenko (clock $\#$ 1 in 1996 {\it Am. J. Phys.} {\bf 64} 812), a change of the rate of the clock when it is set in uniform motion is calculated exactly, employing the correct equation of motion of a charged particle in the electromagnetic field and the universal boostability assumption. Thus, for the clock under consideration, a dynamical content of the clock retardation is demonstrated. Somewhat surprisingly, the analysis presented discloses that some familiar relativistic generalisations concerning the retardation of clocks have to be amended.

physics.class-ph↗

arXiv2015

Direct calculation of length contraction and clock retardation

For simple electromagnetic models of a rod and a clock, a change of the shape of the rod and of the rate of the clock when they are set in uniform motion is calculated exactly, employing the correct equation of motion of a charged particle in the electromagnetic field and the universal boostability assumption. Thus it is demonstrated that, for the simple system considered, length contraction and clock retardation can be interpreted as dynamical cause-and-effect phenomena, and not as kinematical effects as is usually construed in conventional presentations of Special Relativity. It is argued that the perspectival relativistic change of an object (corresponding to observations from two inertial frames), while certainly an acausal effect, has a dynamical content in the sense that it is {\it tantamount to} an actual dynamical change of the object in one frame.

physics.class-ph↗

arXiv2013

Time-dependent fields of a current-carrying wire

The electric and magnetic fields of an infinite straight wire carrying a steady current which is turned on abruptly are determined using Jefimenko's equations, starting from the standard assumption that the wire is electrically neutral in its rest frame. Some nontrivial aspects of the solution are discussed in detail.

physics.class-ph↗