Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2002-08-05
Phys.Part.Nucl.34:808-828,2003; Fiz.Elem.Chast.Atom.Yadra 34:1564-1609,2003
Physics
High Energy Physics
High Energy Physics - Theory
LaTeX 2.09, 37 pages; submitted to Phys. Part. Nucl
Scientific paper
This is a critical review of inert properties of classical relativistic point objects. The objects are classified as Galilean and non-Galilean. Three types of non-Galilean objects are considered: spinning, rigid, and dressed particles. In the absence of external forces, such particles are capable of executing not only uniform motions along straight lines but also Zitterbewegungs, self-accelerations, self-decelerations, and uniformly accelerated motions. A free non-Galilean object possesses the four-velocity and the four-momentum which are in general not collinear, therefore, its inert properties are specified by two, rather than one, invariant quantities. It is shown that a spinning particle need not be a non-Galilean object. The necessity of a rigid mechanics for the construction of a consistent classical electrodynamics in spacetimes of dimension D+1 is justified for D+1>4. The problem of how much the form of fundamental laws of physics orders four dimensions of our world is revised together with its solution suggested by Ehrenfest. The present analysis made it apparent that the notion of the ``back-reaction'' does not reflect the heart of the matter in classical field theories with point-like sources, the notion of ``dressed'' particles proves more appropriate.
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