Evidence for dark energy from the cosmic microwave background alone using the atacama cosmology telescope lensing measurements

Blake D. Sherwin, Joanna Dunkley, Sudeep Das, John W. Appel, J. Richard Bond, C. Sofia Carvalho, Mark J. Devlin, Rolando Dünner, Thomas Essinger-Hileman, Joseph W. Fowler, Amir Hajian, Mark Halpern, Matthew Hasselfield, Adam D. Hincks, Renée Hlozek, John P. Hughes, Kent D. Irwin, Jeff Klein, Arthur Kosowsky, Tobias A. MarriageDanica 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

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Abstract

For 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 ΩΛ confirms other measurements from supernovae, galaxy clusters, and baryon acoustic oscillations, and demonstrates the power of CMB lensing as a new cosmological tool.

Original languageEnglish (US)
Article number021302
JournalPhysical review letters
Volume107
Issue number2
DOIs
StatePublished - Jul 5 2011

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Sherwin, B. D., Dunkley, J., Das, S., Appel, J. W., Bond, J. R., Carvalho, C. S., Devlin, M. J., Dünner, R., Essinger-Hileman, T., Fowler, J. W., Hajian, A., Halpern, M., Hasselfield, M., Hincks, A. D., Hlozek, R., Hughes, J. P., Irwin, K. D., Klein, J., Kosowsky, A., ... Wollack, E. (2011). Evidence for dark energy from the cosmic microwave background alone using the atacama cosmology telescope lensing measurements. Physical review letters, 107(2), [021302]. https://doi.org/10.1103/PhysRevLett.107.021302