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arXiv 1303.3428astro-ph.COastro-ph.HE
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最新观测资料对标量谱指数的约束

Constraints on Scalar Spectral Index from Latest Observational Measurements

Hong Li, Jun-Qing Xia, Xinmin Zhang

摘要:

最近,Wilkinson微波各向异性探测器(WMAP 9)的9年观测数据发现,标量谱指数n_s \geq 1的暴胀模型在约5σ的置信水平上被排除在外。本文结合南极望远镜的小尺度宇宙微波背景测量数据、重子声学振荡数据、哈勃望远镜的哈勃常数测量数据和超新星光度距离数据,给出了不同宇宙学模型中标量谱指数的新的极限。在大多数扩展的宇宙学模型中,例如在暗能量状态方程中,对n_s的约束并没有显著的变化。Harrison-Zel'dovich-Peebles(HZ)标度不变谱在大于4σ的置信水平下仍然不受欢迎。然而,当考虑含有多个相对论性粒子N_{eff}的模型时,由于n_s和N_{eff}之间的强简并性,我们得到了谱指数n_s=0.980 \pm 0.011(1σ)的极限。在95%的置信水平下,HZ光谱现在仍然与当前数据一致。

英文摘要:

Recently, the nine-year data release of the Wilkinson Microwave Anisotropy Probe (WMAP9) found that the inflationary models with the scalar spectral index n_s \geq 1 are excluded at about 5σconfidence level. In this paper, we set the new limits on the scalar spectral index in different cosmological models combining the WMAP9 data with the small-scale cosmic microwave background measurement from the South Pole Telescope, baryon acoustic oscillation data, Hubble Telescope measurements of the Hubble constant, and supernovae luminosity distance data. In most of extended cosmological models, e.g. with a dark energy equation of state, the constraints on n_s do not change significantly. The Harrison-Zel'dovich-Peebles (HZ) scale invariant spectrum is still disfavored at more than 4σconfidence level. However, when considering the model with a number of relativistic species N_{eff}, we obtain the limit on the spectral index of n_s=0.980\pm0.011 (1σ), due to the strong degeneracy between n_s and N_{eff}. The HZ spectrum now is still consistent with the current data at 95% confidence level.

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