https://doi.org/10.1140/epjc/s10052-016-4341-0
Regular Article - Theoretical Physics
Quantum Larmor radiation in de Sitter spacetime
West University of Timişoara, V. Pârvan Ave. 4, 300223, Timisoara, Romania
* e-mail: robert.blaga@e-uvt.ro
Received:
20
March
2016
Accepted:
27
August
2016
Published online:
13
September
2016
We study the radiation emitted by inertial charge evolving on the expanding de Sitter spacetime. Performing a perturbative calculation, within scalar quantum electrodynamics (sQED), we obtain the transition amplitude for the process and using this we define the energy radiated by the source. In the non-relativistic limit we find that the leading term is compatible with the classical result (Larmor formula). The first quantum correction is found to be negative, a result which is in line with a number of similar quantum field theory results. For the ultra-relativistic case we find a logarithmic divergence of the emitted energy for large frequencies, which we link to the nature of the spacetime. We compare our results with that of Nomura et al. (JCAP 11:013, 2006), where the authors make a similar calculation for a general conformally flat spacetime.
© The Author(s), 2016
