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arxiv: 1103.2124 · v3 · pith:6S4G5M5Unew · submitted 2011-03-10 · 🌌 astro-ph.CO

Detection of the Power Spectrum of Cosmic Microwave Background Lensing by the Atacama Cosmology Telescope

Sudeep Das , Blake D. Sherwin , Paula Aguirre , John W. Appel , J. Richard Bond , C. Sofia Carvalho , Mark J. Devlin , Joanna Dunkley
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Rolando Dunner Thomas Essinger-Hileman Joseph W. Fowler Amir Hajian Mark Halpern Matthew Hasselfield Adam D. Hincks Renee Hlozek Kevin M. Huffenberger John P. Hughes Kent D. Irwin Jeff Klein Arthur Kosowsky Robert H. Lupton Tobias A. Marriage Danica Marsden Felipe Menanteau Kavilan Moodley Michael D. Niemack Michael R. Nolta Lyman A. Page Lucas Parker Erik D. Reese Benjamin L. Schmitt Neelima Sehgal Jon Sievers David N. Spergel Suzanne T. Staggs Daniel S. Swetz Eric R. Switzer Robert Thornton Katerina Visnjic Ed Wollack
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classification 🌌 astro-ph.CO
keywords amplitudedetectioncosmologydensityfluctuationslensingpowerscales
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We report the first detection of the gravitational lensing of the cosmic microwave background through a measurement of the four-point correlation function in the temperature maps made by the Atacama Cosmology Telescope. We verify our detection by calculating the levels of potential contaminants and performing a number of null tests. The resulting convergence power spectrum at 2-degree angular scales measures the amplitude of matter density fluctuations on comoving length scales of around 100 Mpc at redshifts around 0.5 to 3. The measured amplitude of the signal agrees with Lambda Cold Dark Matter cosmology predictions. Since the amplitude of the convergence power spectrum scales as the square of the amplitude of the density fluctuations, the 4-sigma detection of the lensing signal measures the amplitude of density fluctuations to 12%.

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