On energy and momentum of an ultrarelativistic unstable system

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We study an electron bunch together with its self-fields from the viewpoint of basic dynamical quantities. This leads to a methodological discussion about the definition of energy and momentum for fully electromagnetic systems and about the relation between covariance of the energy-momentum pair and stability. We show here that, in the case of unstable systems, there is no mean to define, in a physically meaningful way, a total energy-momentum four-vector: covariance of the energy-momentum pair follows from the stability of the system and viceversa, as originally pointed out by Henry Poincare'.
10 pages, 3 figures

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Accelerator Physics

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http://salesiana.dossiersoluciones.com/handle/123456789/85034

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/physics/0211093
 http://arxiv.org/abs/physics/0211093

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arXiv