Local and nonlocal spatial densities in quantum field theory

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	Local and nonlocal spatial densities in quantum field theory
	Wagner, RE ; Ware, MR ; Stefanovich, EV ; Su, Q ; Grobe, R
刊名	PHYSICAL REVIEW A
	2012
卷号	85 期号:2
关键词	MECHANICS
ISSN号	1050-2947
通讯作者	Wagner, RE: Illinois State Univ, Intense Laser Phys Theory Unit, Dept Phys, Normal, IL 61790 USA.
中文摘要	We use a one-dimensional model system to compare the predictions of two different yardsticks to compute the position of a particle from its quantum field theoretical state. Based on the first yardstick (defined by the Newton-Wigner position operator), the spatial density can be arbitrarily narrow, and its time evolution is superluminal for short time intervals. Furthermore, two spatially distant particles might be able to interact with each other outside the light cone, which is manifested by an asymmetric spreading of the spatial density. The second yardstick (defined by the quantum field operator) does not permit localized states, and the time evolution is subluminal.
收录类别	SCI
资助信息	NSF; NSFC [11128409]
语种	英语
公开日期	2013-09-18
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/40920]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Wagner, RE,Ware, MR,Stefanovich, EV,et al. Local and nonlocal spatial densities in quantum field theory[J]. PHYSICAL REVIEW A,2012,85(2).
APA	Wagner, RE,Ware, MR,Stefanovich, EV,Su, Q,&Grobe, R.(2012).Local and nonlocal spatial densities in quantum field theory.PHYSICAL REVIEW A,85(2).
MLA	Wagner, RE,et al."Local and nonlocal spatial densities in quantum field theory".PHYSICAL REVIEW A 85.2(2012).