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	Bouncing galileon cosmologies
	Qiu, Taotao1; Evslin, Jarah2; Cai, Yi-Fu2,3; Li, Mingzhe4; Zhang, Xinmin2
刊名	Journal of cosmology and astroparticle physics
	2011-10-01
期号	10页码:26
关键词	Alternatives to inflation Cosmological perturbation theory
ISSN号	1475-7516
DOI	10.1088/1475-7516/2011/10/036
通讯作者	Qiu, taotao(xsjqiu@gmail.com)
英文摘要	We present nonsingular, homogeneous and isotropic bouncing solutions of the conformal galileon model. we show that such solutions necessarily begin with a radiation-dominated contracting phase. this is followed by a quintom scenario in which the background equation of state crosses the cosmological constant boundary allowing for a nonsingular bounce which in turn is followed by galilean genesis. we analyze the spectrum of cosmological perturbations in this background. our results show that the fluctuations evolve smoothly and without any pathology, but the adiabatic modes form a blue tilted spectrum. in order to achieve a scale-invariant primordial power spectrum as required by current observations, we introduce a light scalar field coupling to the galileon kinetically. we find two couplings which yield a scale-invariant spectrum, one of which requires a fine tuning of the initial conditions. this model also predicts a blue tilted spectrum of gravitational waves stemming from quantum vacuum fluctuations in the contracting phase.
WOS关键词	PRE-BIG-BANG ; COUPLED QUINTOM MATTER ; DARK ENERGY ; STRING COSMOLOGY ; UNIVERSE ; PERTURBATIONS ; GRAVITY ; MODEL ; CONSTRAINTS ; INFLATION
WOS研究方向	Astronomy & Astrophysics ; Physics
WOS类目	Astronomy & Astrophysics ; Physics, Particles & Fields
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000296767600036
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2176085
专题	高能物理研究所
通讯作者	Qiu, Taotao
作者单位	1.Chung Yuan Christian Univ, Dept Phys, Chungli 320, Taiwan 2.Chinese Acad Sci, TPCSF, Inst High Energy Phys, Beijing 100049, Peoples R China 3.Arizona State Univ, Dept Phys, Tempe, AZ 85287 USA 4.Nanjing Univ, Dept Phys, Nanjing 210093, Peoples R China
推荐引用方式 GB/T 7714	Qiu, Taotao,Evslin, Jarah,Cai, Yi-Fu,et al. Bouncing galileon cosmologies[J]. Journal of cosmology and astroparticle physics,2011(10):26.
APA	Qiu, Taotao,Evslin, Jarah,Cai, Yi-Fu,Li, Mingzhe,&Zhang, Xinmin.(2011).Bouncing galileon cosmologies.Journal of cosmology and astroparticle physics(10),26.
MLA	Qiu, Taotao,et al."Bouncing galileon cosmologies".Journal of cosmology and astroparticle physics .10(2011):26.

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