Spontaneous leptogenesis in Brans-Dicke cosmology

	Spontaneous leptogenesis in Brans-Dicke cosmology
	Chen, CY ; Shen, YG ; Feng, B
刊名	HIGH ENERGY PHYSICS AND NUCLEAR PHYSICS-CHINESE EDITION
	2005-11-01
卷号	29 期号:11 页码:1033-1040
关键词	leptogenesis scalar coupling Brans-Dicke cosmology
英文摘要	The role of the auxiliary scalar field phi of BD theory in baryon number asymmetry is discussed in this paper. We consider a derivative coupling of this gravitational scalar field to the baryon current J(B)(mu) or the current of the baryon number minus lepton number J(B-L)(mu), based on a series of works of R. Morganstern about the Brans-Dicke cosmology. We find that the spontaneous baryogenesis by this coupling is able to yield sufficient baryon asymmetry n(B)/s similar to 10(-10) provided the time of the grand unification is a little bit earlier. In addition, Davoudiasl et al have recently introduced a new type of interaction between the Ricci scalar R and the bayon current J(mu), partial derivative(mu), RJ(mu) and also proposed a mechanism for baryogenesis, the gravitational baryogenesis. However, the Einstein equation tells us that (R) over circle = 0 in the radiation-dominated epoch of the standard FRW cosmology. In this paper we reconsider the feasibility of having gravitational baryongenesis with such a form of interaction in radiation-filled BD cosmology. We show that (R) over circle does not vanish in this case and the required baryon number asymmetry can also be achieved.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Physics, Nuclear ; Physics, Particles & Fields
研究领域[WOS]	Physics
关键词[WOS]	FLAT FRIEDMANN UNIVERSES ; WEINBERG-SALAM THEORY ; EXTENDED INFLATION ; RELATIVISTIC THEORY ; BARYON ASYMMETRY ; MACHS PRINCIPLE ; DARK-MATTER ; SCALAR ; MODELS ; BARYOGENESIS
收录类别	SCI
语种	英语
WOS记录号	WOS:000233323300002
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/19390]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 4.Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China 5.Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China 6.Hangzhou Teachers Coll, Hangzhou 310018, Peoples R China
推荐引用方式 GB/T 7714	Chen, CY,Shen, YG,Feng, B. Spontaneous leptogenesis in Brans-Dicke cosmology[J]. HIGH ENERGY PHYSICS AND NUCLEAR PHYSICS-CHINESE EDITION,2005,29(11):1033-1040.
APA	Chen, CY,Shen, YG,&Feng, B.(2005).Spontaneous leptogenesis in Brans-Dicke cosmology.HIGH ENERGY PHYSICS AND NUCLEAR PHYSICS-CHINESE EDITION,29(11),1033-1040.
MLA	Chen, CY,et al."Spontaneous leptogenesis in Brans-Dicke cosmology".HIGH ENERGY PHYSICS AND NUCLEAR PHYSICS-CHINESE EDITION 29.11(2005):1033-1040.