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arXiv 1105.4887astro-ph.CO
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阿塔卡马宇宙学望远镜:原始功率谱的测量

The Atacama Cosmology Telescope: a measurement of the primordial power spectrum

Renée Hlozek, Joanna Dunkley, Graeme Addison, John William Appel, J. Richard Bond, C. Sofia Carvalho, Sudeep Das, Mark Devlin, Rolando Dünner, Thomas Essinger-H… 展开作者

Renée Hlozek, Joanna Dunkley, Graeme Addison, John William Appel, J. Richard Bond, C. Sofia Carvalho, Sudeep Das, Mark Devlin, Rolando Dünner, Thomas Essinger-Hileman, Joseph Fowler, Patricio Gallardo, Amir Hajian, Mark Halpern, Matthew Hasselfield, Matt Hilton, Adam D. Hincks, John P. Hughes, Kent Irwin, Jeff Klein, Arthur Kosowsky, Tobias A. Marriage, Danica Marsden, Felipe Menanteau, Kavilan Moodley, Michael D. Niemack, Michael R. Nolta, Lyman Page, Lucas Parker, Bruce Partridge, Felipe Rojas, Neelima Sehgal, Blake Sherwin, Jon Sievers, David Spergel, Suzanne Staggs, Daniel Swetz, Eric Switzer, Robert Thornton, Ed Wollack

摘要:

我们提出了约束的原始功率谱的绝热波动使用的数据从2008年南部调查的阿塔卡马宇宙望远镜(ACT)。ACT的角分辨率为原始温度功率谱中多个峰的分辨率提供了对\ell = 1000以上尺度的灵敏度,这使我们能够探测波数高达k \simeq 0.2 Mpc^{-1}的绝热标量扰动的原始功率谱。我们没有发现任何证据偏离幂律波动超过二十年的规模。从原始温度功率谱推断出的物质波动随着宇宙时间的推移而演变,并可用于预测物质功率谱的后期;我们说明了从CMB测量(探测线性制度中的功率谱)推断出的物质功率与现有探测器的星系团簇,星系团丰度和弱透镜约束对原始功率的重叠。这突出了目前对物质功率谱的测量所探测的尺度范围。

英文摘要:

We present constraints on the primordial power spectrum of adiabatic fluctuations using data from the 2008 Southern Survey of the Atacama Cosmology Telescope (ACT). The angular resolution of ACT provides sensitivity to scales beyond \ell = 1000 for resolution of multiple peaks in the primordial temperature power spectrum, which enables us to probe the primordial power spectrum of adiabatic scalar perturbations with wavenumbers up to k \simeq 0.2 Mpc^{-1}. We find no evidence for deviation from power-law fluctuations over two decades in scale. Matter fluctuations inferred from the primordial temperature power spectrum evolve over cosmic time and can be used to predict the matter power spectrum at late times; we illustrate the overlap of the matter power inferred from CMB measurements (which probe the power spectrum in the linear regime) with existing probes of galaxy clustering, cluster abundances and weak lensing constraints on the primordial power. This highlights the range of scales probed by current measurements of the matter power spectrum.

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