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25 April 2024

» arxiv » 1103.2124

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The Atacama Cosmology Telescope: Detection of the Power Spectrum of Gravitational Lensing
Sudeep Das ; Blake D. Sherwin ; Paula Aguirre ; John W. Appel ; J. Richard Bond ; C. Sofia Carvalho ; Mark J. Devlin ; Joanna Dunkley ; 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 ; 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 ;
Date:	10 Mar 2011
Abstract:	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 1 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%.
Source:	arXiv, 1103.2124
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