Portal de Periódicos da CAPES

Evidence for Dark Energy from the Cosmic Microwave Background Alone Using the Atacama Cosmology Telescope Lensing Measurements

2011; American Physical Society; Volume: 107; Issue: 2 Linguagem: Inglês

10.1103/physrevlett.107.021302

1092-0145

Blake D. Sherwin, Joanna Dunkley, Sudeep Das, John W. Appel, J. Richard Bond, C. S. Carvalho, Mark J. Devlin, Rolando Dünner, Thomas Essinger-Hileman, Joseph W. Fowler, Amir Hajian, M. Halpern, Matthew Hasselfield, Adam D. Hincks, Renée Hložek, John P. Hughes, K. D. Irwin, Jeff Klein, Arthur Kosowsky, Tobias A. Marriage, Danica Marsden, Kavilan Moodley, F. Menanteau, Michael D. Niemack, Michael R. Nolta, Lyman A. Page, Lucas Parker, Erik D. Reese, Benjamin L. Schmitt, Neelima Sehgal, Jonathan Sievers, David N. Spergel, Suzanne T. Staggs, Daniel S. Swetz, Eric R. Switzer, Robert Thornton, Katerina Visnjic, Edward J. Wollack,

Galaxies: Formation, Evolution, Phenomena

For the first time, measurements of the cosmic microwave background radiation (CMB) alone favor cosmologies with $w=\ensuremath{-}1$ 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 ${\ensuremath{\Omega}}_{\ensuremath{\Lambda}}$ confirms other measurements from supernovae, galaxy clusters, and baryon acoustic oscillations, and demonstrates the power of CMB lensing as a new cosmological tool.