Flat limit of the de Sitter QFT in the rest frame vacuum  

作　　者：Ion I.Cotaescu 

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

出　　处：《Chinese Physics C》2021年第1期97-108,共12页中国物理C（英文版）

摘　　要：The problem of the flat limits of the scalar and spinor fields on the de Sitter expanding universe is considered in the traditional adiabatic vacuum and in the new rest frame vacuum we proposed recently,in which the frequencies are separated in the rest frames as in special relativity.It is shown that only in the rest frame vacuum can the Minkowskian flat limit be reached naturally fbr any momentum,whereas in the adiabatic vacuum,this limit remains undefined in rest frames in which the momentum vanishes.An important role is played by the phases of the fundamental solutions in the rest frame vacuum,which must be regularized to obtain the desired Minkowskian flat limits.This procedure fixes the phases of the scalar mode functions and Dirac spinors,resulting in their definitive expressions derived here.The physical consequenee is that,in the rest frame vacuum,the flat limits of the oneparticle operators are simply the corresponding operators of special relativity.

关 键 词：de Sitter space-time Klein-Gordon field Dirac field flat limit approximation method phase regularization 

分 类 号：O17[理学—数学]