Testing Dvali-Gabadadze-Porrati gravity with Planck

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	Testing Dvali-Gabadadze-Porrati gravity with Planck
	Li H(李虹); 夏俊卿;Li, H; Xia, JQ
刊名	PHYSICS LETTERS B
	2013
卷号	726 期号:4-5 页码:549-553
英文摘要	Recently, the Planck Collaboration has released the first cosmological papers providing the highest resolution, full sky, maps of the cosmic microwave background (CMB) temperature anisotropies. It is crucial to understand that whether the accelerating expansion of our universe at present is driven by an unknown energy component (Dark Energy) or a modification to general relativity (Modified Gravity). In this Letter we study a phenomenological model which interpolates between the pure Lambda CDM model and the Dvali-Gabadadze-Porrati (DGP) braneworld model with an additional parameter alpha. Firstly, we calculate the "distance information" of Planck data which includes the "shift parameter" R, the "acoustic scale" l(A), and the photon decoupling epoch z(*) in different cosmological models and find that this information is almost independent on the input models we use. Then, we compare the constraints on the free parameter alpha of the DGP model from the "distance information" of Planck and WMAP data and find that the Planck data with high precision do not improve the constraint on a, but give the higher median value and the better limit on the current matter density fraction Omega(m). Then, combining the "distance information" of Planck measurement, baryon acoustic oscillations (BAO), Type la supernovae (SNIa) and the prior on the current Hubble constant (HST), we obtain the tight constraint on the parameter alpha < 0.20 at 95% confidence level, which implies that the flat DGP model has been ruled out by the current cosmological data. Finally, we allow the additional parameter alpha < 0 in our calculations and interestingly obtain alpha = -0.29 +/- 0.20 (68% C.L.), which means the current data slightly favor the effective equation of state w(eff) < -1. More importantly, the tension between constraints on H-0 from different observational data has been eased. (C) 2013 Elsevier B.V. All rights reserved.
学科主题	Physics
收录类别	SCI
WOS记录号	WOS:000327907000001
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/224013]
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	Li H,夏俊卿；Li, H,Xia, JQ. Testing Dvali-Gabadadze-Porrati gravity with Planck[J]. PHYSICS LETTERS B,2013,726(4-5):549-553.
APA	李虹,夏俊卿；Li, H,&Xia, JQ.(2013).Testing Dvali-Gabadadze-Porrati gravity with Planck.PHYSICS LETTERS B,726(4-5),549-553.
MLA	李虹,et al."Testing Dvali-Gabadadze-Porrati gravity with Planck".PHYSICS LETTERS B 726.4-5(2013):549-553.