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	Evidence for Bouncing Evolution Before Inflation After BICEP2
	Xia JQ(夏俊卿); Xia, JQ; Li H(李虹); Cai, YF; Li, H; Zhang, XM;张新民
刊名	PHYSICAL REVIEW LETTERS
	2014
卷号	112期号:25页码:251301
英文摘要	The BICEP2 Collaboration reports a detection of primordial cosmic microwave background (CMB) B mode with a tensor-to-scalar ratio r = 0.20(-0.05)(+0.07)(68% C.L.). However, this result disagrees with the recent Planck limit r < 0.11 (95% C.L.) on constraining inflation models. In this Letter we consider an inflationary cosmology with a preceding nonsingular bounce, which gives rise to observable signatures on primordial perturbations. One interesting phenomenon is that both the primordial scalar and tensor modes can have a step feature on their power spectra, which nicely cancels the tensor excess power on the CMB temperature power spectrum. By performing a global analysis, we obtain the 68% C.L. constraints on the parameters of the model from the Planck + WP and BICEP2 data together: the jump scale log(10)(k(B)/Mpc(-1)) = -2.4 +/- 0.2 and the spectrum amplitude ratio of bounce to inflation r(B) = P-m/A(s) = 0.71 +/- 0.09. Our result reveals that the bounce inflation scenario can simultaneously explain the Planck and BICEP2 observations better than the standard cold dark matter model with a cosmological constant, and can be verified by future CMB polarization measurements.
学科主题	Physics
收录类别	SCI
WOS记录号	WOS:000338284900002
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/225295]
专题	高能物理研究所_粒子天体物理中心
推荐引用方式 GB/T 7714	Xia JQ,Xia, JQ,Li H,et al. Evidence for Bouncing Evolution Before Inflation After BICEP2[J]. PHYSICAL REVIEW LETTERS,2014,112(25):251301.
APA	夏俊卿,Xia, JQ,李虹,Cai, YF,Li, H,&Zhang, XM；张新民.(2014).Evidence for Bouncing Evolution Before Inflation After BICEP2.PHYSICAL REVIEW LETTERS,112(25),251301.
MLA	夏俊卿,et al."Evidence for Bouncing Evolution Before Inflation After BICEP2".PHYSICAL REVIEW LETTERS 112.25(2014):251301.

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