First order QED processes in a spatially flat FLRW space-time with a Milne-type scale factor  

作　　者：Ion ICotaescu Diana Popescu 

机构地区：[1]West University of Timisoara,V.Parvan Ave.4,RO-300223 Timisoara,Romania

出　　处：《Chinese Physics C》2020年第5期140-149,共10页中国物理C（英文版）

摘　　要：The quantum electrodynamics(QED)in a spatially flat(1+3)-dimensional Friedmann-Lema?tre-Robertson-Walker(FLRW)space-time with a Milne-type scale factor is outlined focusing on the amplitudes of the allowed processes in the first order perturbations.The definition of the transition rates is reconsidered such that an appropriate angular behavior of the probability for creation of an electron-positron pair from a photon is obtained,which has a similar rate as the creation of a photon and an electron-positron pair from vacuum.It is shown that these processes are allowed only in the first order perturbations,since the photon emission or absorption by an electron or positron are forbidden.

关 键 词：spatially FLAT FLRW SPACE-TIME Milne-type scale factor first order AMPLITUDES transition rates 

分 类 号：O413.2[理学—理论物理]