Presentation
18 April 2021 Radiation reaction of a charged sphere undergoing uniform acceleration and uniform circular motion
Author Affiliations +
Abstract
Classical electrodynamics basically assumes that a charged particle is a point charge, whose size is infinitesimal. This assumption caused a lot of problems with the radiation reaction (also called the self-force), by which a radiating particle feels friction. For example, Lorentz-Abraham-Dirac (LAD) model, which is the earliest theory about radiation reaction based on a point charge, leads to unphysical solutions such as runaway solutions and preacceleration. It has been tried to modify LAD model, and the most successful result was Landau-Lifshitz (LL) model, which also interpret well the recent experimental data of radiation reaction from laser-plasma interactions. However, even LL model has some problems, and particularly it cannot explain the radiation reaction of a uniformly accelerated charge. In this talk, we assume that the size of a particle is finite but the particle itself is completely indistinguishable from a point charge. By this assumption, we calculate the self-force of this particle undergoing uniform acceleration and uniform circular motion. The calculations show that the self-force of uniform acceleration can increase the effective mass of the particle, and it explain why a uniformly accelerated particle needs more energy to radiate. The calculations also indicate that the self-force of uniform circular motion only depends on the acceleration at the retarded time. In addition, we propose that there is a classical limit of the acceleration, and by combining it with the Schwinger limit we suggest that the classical radius of a particle is somehow related to the reduced Compton wavelength.
Conference Presentation
© (2021) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Teyoun Kang, Adam Noble, Samuel R. Yoffe, Dino A. Jaroszynski, and Min Sup Hur "Radiation reaction of a charged sphere undergoing uniform acceleration and uniform circular motion", Proc. SPIE 11778, Relativistic Plasma Waves and Particle Beams as Coherent and Incoherent Radiation Sources IV, 117780G (18 April 2021); https://doi.org/10.1117/12.2589119
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KEYWORDS
Particles

Optical spheres

Data modeling

Electrodynamics

Motion models

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