English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We investigate the quantum effect on the Larmor radiation from a movingcharge in an expanding universe based on the framework of the scalar quantumelectrodynamics (SQED). A theoretical formula for the radiation energy isderived at the lowest order of the perturbation theory with respect to thecoupling constant of the SQED. We evaluate the radiation energy on thebackground universe so that the Minkowski spacetime transits to the Milneuniverse, in which the equation of motion for the mode function of the freecomplex scalar field can be exactly solved in an analytic way. Then, the resultis compared with the WKB approach, in which the equation of motion of the modefunction is constructed with the WKB approximation which is valid as long asthe Compton wavelength is shorter than the Hubble horizon length. Thisdemonstrates that the quantum effect on the Larmor radiation of the ordere^2\hbar is determined by a non-local integration in time depending on thebackground expansion. We also compare our result with a recent work by Higuchiand Walker [Phys. Rev. D80 105019 (2009)], which investigated the quantumcorrection to the Larmor radiation from a charged particle in anon-relativistic motion in a homogeneous electric field.

Quantum Larmor radiation in conformally flat universe