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Nonsingular cosmology with a scale-invariant spectrum of cosmological perturbations from Lee-Wick theory
Cai YF(蔡一夫); Qiu TT(邱涛涛); Cai, YF; Qiu, TT; Brandenberger, R; Zhang, XM; Zhang XM(张新民)
2009
发表期刊PHYSICAL REVIEW D
卷号80期号:2页码:23511
通讯作者[Cai, Yi-Fu ; Qiu, Taotao ; Brandenberger, Robert ; Zhang, Xinmin] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China ; [Brandenberger, Robert] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada ; [Brandenberger, Robert ; Zhang, Xinmin] Chinese Acad Sci, Theoret Phys Ctr Sci Facil TPCSF, Beijing 100049, Peoples R China
文章类型Article
摘要We study the cosmology of a Lee-Wick type scalar field theory. First, we consider homogeneous and isotropic background solutions and find that they are nonsingular, leading to cosmological bounces. Next, we analyze the spectrum of cosmological perturbations which result from this model. Unless either the potential of the Lee-Wick theory or the initial conditions are finely tuned, it is impossible to obtain background solutions which have a sufficiently long period of inflation after the bounce. More interestingly, however, we find that in the generic noninflationary bouncing cosmology, perturbations created from quantum vacuum fluctuations in the contracting phase have the correct form to lead to a scale-invariant spectrum of metric inhomogeneities in the expanding phase. Since the background is nonsingular, the evolution of the fluctuations is defined unambiguously through the bounce. We also analyze the evolution of fluctuations which emerge from thermal initial conditions in the contracting phase. The spectrum of gravitational waves stemming from quantum vacuum fluctuations in the contracting phase is also scale-invariant, and the tensor to scalar ratio is not suppressed.
学科领域Astronomy & Astrophysics; Physics
研究领域[WOS]Astronomy & Astrophysics ; Physics ; Astronomy & Astrophysics ; Physics
DOI10.1103/PhysRevD.80.023511
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语种英语
研究领域[WOS]Astronomy & Astrophysics ; Physics ; Astronomy & Astrophysics ; Physics
WOS类目Astronomy & Astrophysics ; Physics, Particles & Fields
WOS记录号WOS:000268618800027
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被引频次:121[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/240494
专题理论物理室
作者单位中国科学院高能物理研究所
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Cai YF,Qiu TT,Cai, YF,et al. Nonsingular cosmology with a scale-invariant spectrum of cosmological perturbations from Lee-Wick theory[J]. PHYSICAL REVIEW D,2009,80(2):23511.
APA 蔡一夫.,邱涛涛.,Cai, YF.,Qiu, TT.,Brandenberger, R.,...&张新民.(2009).Nonsingular cosmology with a scale-invariant spectrum of cosmological perturbations from Lee-Wick theory.PHYSICAL REVIEW D,80(2),23511.
MLA 蔡一夫,et al."Nonsingular cosmology with a scale-invariant spectrum of cosmological perturbations from Lee-Wick theory".PHYSICAL REVIEW D 80.2(2009):23511.
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