Cosmology of the spinor emergent universe and scale-invariant perturbations

	Cosmology of the spinor emergent universe and scale-invariant perturbations
	Cai, YF; Wan YP(万友平); 张新民;Wan, YP; Zhang, XM
刊名	PHYSICS LETTERS B
	2014
卷号	731 页码:217-226
英文摘要	A nonsingular emergent universe cosmology can be realized by a nonconventional spinor field as first developed in [1]. We study the mechanisms of generating scale-invariant primordial power spectrum of curvature perturbation in the frame of spinor emergent universe cosmology. Particularly, we introduce a light scalar field of which the kinetic term couples to the bilinear of the spinor field. This kinetic coupling can give rise to an effective "Hubble radius" for primordial fluctuations which allows the scalar field to become squeezed at large length scales and to form a nearly scale-invariant power spectrum. We study the stability of the backreaction and constrain the forms of the coupling terms. Through a generalized curvaton mechanism, these almost scale independent fluctuations are able to be transferred into curvature perturbation after the epoch of emergence and can thus explain cosmological observations. (C) 2014 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license
学科主题	Physics
收录类别	SCI
WOS记录号	WOS:000334094500034
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/225302]
专题	高能物理研究所_理论物理室
推荐引用方式 GB/T 7714	Cai, YF,Wan YP,张新民；Wan, YP,et al. Cosmology of the spinor emergent universe and scale-invariant perturbations[J]. PHYSICS LETTERS B,2014,731:217-226.
APA	Cai, YF,万友平,张新民；Wan, YP,&Zhang, XM.(2014).Cosmology of the spinor emergent universe and scale-invariant perturbations.PHYSICS LETTERS B,731,217-226.
MLA	Cai, YF,et al."Cosmology of the spinor emergent universe and scale-invariant perturbations".PHYSICS LETTERS B 731(2014):217-226.