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Abstract
Photon emission from a uniformly accelerated charge is among the most mysterious physical phenomena. Theories based on the LorentzAbrahamDirac equation mostly conclude that a uniformly accelerated point charge cannot feel radiation reaction. Such a conclusion suggests that the origin of the photon energy is unclear. In this paper, we determine the selfforce of a uniformly accelerated charged sphere using the Lorentz force equation, with an assumption that the sphere is Lorentzcontracted during the acceleration. For large acceleration, the calculated selfforce converges to the radiation reaction (given by the Larmor formula) via a new factor γ_{a}, which describes an accelerationdependent increase in the effective mass. This increased mass makes it harder to accelerate the particle (compared to a pointcharge), which means more energy should be provided to the particle in order to get the expected acceleration. This extra energy can be interpreted as the origin of the photon energy.
Original language  English 

Article number  127445 
Number of pages  5 
Journal  Physics Letters A 
Volume  407 
Early online date  20 May 2021 
DOIs  
Publication status  Epub ahead of print  20 May 2021 
Keywords
 radiation reaction
 uniform acceleration
 electrodynamics

Lab in a bubble
Jaroszynski, D., Boyd, M., Brunetti, E., Ersfeld, B., Hidding, B., McKenna, P., Noble, A., Sheng, Z., Vieux, G., Welsh, G. H. & Wiggins, M.
EPSRC (Engineering and Physical Sciences Research Council)
1/04/16 → 31/03/21
Project: Research