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29 March 2024
 
  » arxiv » 1105.0419

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The Atacama Cosmology Telescope: Evidence for Dark Energy from the CMB Alone
Blake D. Sherwin ; Joanna Dunkley ; Sudeep Das ; John W. Appel ; J. Richard Bond ; C. Sofia Carvalho ; Mark J. Devlin ; Rolando Dunner ; Thomas Essinger-Hileman ; Joseph W. Fowler ; Amir Hajian ; Mark Halpern ; Matthew Hasselfield ; Adam D. Hincks ; Renee Hlozek ; John P. Hughes ; Kent D. Irwin ; Jeff Klein ; Arthur Kosowsky ; Tobias A. Marriage ; Danica Marsden ; Kavilan Moodley ; Felipe Menanteau ; 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 2 May 2011
AbstractFor the first time, measurements of the cosmic microwave background radiation (CMB) alone favor cosmologies with $w=-1$ dark energy over models without dark energy at a 3.2-sigma level. We demonstrate this by combining the CMB lensing deflection power spectrum from the Atacama Cosmology Telescope with temperature and polarization power spectra from the Wilkinson Microwave Anisotropy Probe. The lensing data break the geometric degeneracy of different cosmological models with similar CMB temperature power spectra. Our CMB-only measurement of the dark energy density $Omega_Lambda$ confirms other measurements from supernovae, galaxy clusters and baryon acoustic oscillations, and demonstrates the power of CMB lensing as a new cosmological tool.
Source arXiv, 1105.0419
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