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Constraints on Primordial Gravitational Waves Using Planck, WMAP, and New BICEP2/Keck Observations through the 2015 Season.
Ade, P A R; Ahmed, Z; Aikin, R W; Alexander, K D; Barkats, D; Benton, S J; Bischoff, C A; Bock, J J; Bowens-Rubin, R; Brevik, J A; Buder, I; Bullock, E; Buza, V; Connors, J; Cornelison, J; Crill, B P; Crumrine, M; Dierickx, M; Duband, L; Dvorkin, C; Filippini, J P; Fliescher, S; Grayson, J; Hall, G; Halpern, M; Harrison, S; Hildebrandt, S R; Hilton, G C; Hui, H; Irwin, K D; Kang, J; Karkare, K S; Karpel, E; Kaufman, J P; Keating, B G; Kefeli, S; Kernasovskiy, S A; Kovac, J M; Kuo, C L; Larsen, N A; Lau, K; Leitch, E M; Lueker, M; Megerian, K G; Moncelsi, L; Namikawa, T; Netterfield, C B; Nguyen, H T; O'Brient, R; Ogburn, R W.
Affiliation
  • Ade PAR; School of Physics and Astronomy, Cardiff University, Cardiff, CF24 3AA, United Kingdom.
  • Ahmed Z; Kavli Institute for Particle Astrophysics and Cosmology, SLAC National Accelerator Laboratory, 2575 Sand Hill Rd, Menlo Park, California 94025, USA.
  • Aikin RW; Department of Physics, California Institute of Technology, Pasadena, California 91125, USA.
  • Alexander KD; Harvard-Smithsonian Center for Astrophysics, 60 Garden Street MS 42, Cambridge, Massachusetts 02138, USA.
  • Barkats D; Harvard-Smithsonian Center for Astrophysics, 60 Garden Street MS 42, Cambridge, Massachusetts 02138, USA.
  • Benton SJ; Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.
  • Bischoff CA; Department of Physics, University of Cincinnati, Cincinnati, Ohio 45221, USA.
  • Bock JJ; Department of Physics, California Institute of Technology, Pasadena, California 91125, USA.
  • Bowens-Rubin R; Jet Propulsion Laboratory, Pasadena, California 91109, USA.
  • Brevik JA; Harvard-Smithsonian Center for Astrophysics, 60 Garden Street MS 42, Cambridge, Massachusetts 02138, USA.
  • Buder I; Department of Physics, California Institute of Technology, Pasadena, California 91125, USA.
  • Bullock E; Harvard-Smithsonian Center for Astrophysics, 60 Garden Street MS 42, Cambridge, Massachusetts 02138, USA.
  • Buza V; Minnesota Institute for Astrophysics, University of Minnesota, Minneapolis, Minnesota 55455, USA.
  • Connors J; Harvard-Smithsonian Center for Astrophysics, 60 Garden Street MS 42, Cambridge, Massachusetts 02138, USA.
  • Cornelison J; Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
  • Crill BP; Harvard-Smithsonian Center for Astrophysics, 60 Garden Street MS 42, Cambridge, Massachusetts 02138, USA.
  • Crumrine M; Harvard-Smithsonian Center for Astrophysics, 60 Garden Street MS 42, Cambridge, Massachusetts 02138, USA.
  • Dierickx M; Jet Propulsion Laboratory, Pasadena, California 91109, USA.
  • Duband L; School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
  • Dvorkin C; Harvard-Smithsonian Center for Astrophysics, 60 Garden Street MS 42, Cambridge, Massachusetts 02138, USA.
  • Filippini JP; Service des Basses Températures, Commissariat à l'Energie Atomique, 38054 Grenoble, France.
  • Fliescher S; Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
  • Grayson J; Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
  • Hall G; Department of Astronomy, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
  • Halpern M; School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
  • Harrison S; Department of Physics, Stanford University, Stanford, California 94305, USA.
  • Hildebrandt SR; School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
  • Hilton GC; Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, V6T 1Z1, Canada.
  • Hui H; Harvard-Smithsonian Center for Astrophysics, 60 Garden Street MS 42, Cambridge, Massachusetts 02138, USA.
  • Irwin KD; Department of Physics, California Institute of Technology, Pasadena, California 91125, USA.
  • Kang J; Jet Propulsion Laboratory, Pasadena, California 91109, USA.
  • Karkare KS; National Institute of Standards and Technology, Boulder, Colorado 80305, USA.
  • Karpel E; Department of Physics, California Institute of Technology, Pasadena, California 91125, USA.
  • Kaufman JP; Kavli Institute for Particle Astrophysics and Cosmology, SLAC National Accelerator Laboratory, 2575 Sand Hill Rd, Menlo Park, California 94025, USA.
  • Keating BG; Department of Physics, Stanford University, Stanford, California 94305, USA.
  • Kefeli S; National Institute of Standards and Technology, Boulder, Colorado 80305, USA.
  • Kernasovskiy SA; Department of Physics, Stanford University, Stanford, California 94305, USA.
  • Kovac JM; Harvard-Smithsonian Center for Astrophysics, 60 Garden Street MS 42, Cambridge, Massachusetts 02138, USA.
  • Kuo CL; Kavli Institute for Cosmological Physics, University of Chicago, Chicago, Illinois 60637, USA.
  • Larsen NA; Department of Physics, Stanford University, Stanford, California 94305, USA.
  • Lau K; Department of Physics, University of California at San Diego, La Jolla, California 92093, USA.
  • Leitch EM; Department of Physics, University of California at San Diego, La Jolla, California 92093, USA.
  • Lueker M; Department of Physics, California Institute of Technology, Pasadena, California 91125, USA.
  • Megerian KG; Department of Physics, Stanford University, Stanford, California 94305, USA.
  • Moncelsi L; Harvard-Smithsonian Center for Astrophysics, 60 Garden Street MS 42, Cambridge, Massachusetts 02138, USA.
  • Namikawa T; Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
  • Netterfield CB; Kavli Institute for Particle Astrophysics and Cosmology, SLAC National Accelerator Laboratory, 2575 Sand Hill Rd, Menlo Park, California 94025, USA.
  • Nguyen HT; Department of Physics, Stanford University, Stanford, California 94305, USA.
  • O'Brient R; Kavli Institute for Cosmological Physics, University of Chicago, Chicago, Illinois 60637, USA.
  • Ogburn RW; School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
Phys Rev Lett ; 121(22): 221301, 2018 Nov 30.
Article in En | MEDLINE | ID: mdl-30547645
ABSTRACT
We present results from an analysis of all data taken by the bicep2/Keck CMB polarization experiments up to and including the 2015 observing season. This includes the first Keck Array observations at 220 GHz and additional observations at 95 and 150 GHz. The Q and U maps reach depths of 5.2, 2.9, and 26 µK_{CMB} arcmin at 95, 150, and 220 GHz, respectively, over an effective area of ≈400 square degrees. The 220 GHz maps achieve a signal to noise on polarized dust emission approximately equal to that of Planck at 353 GHz. We take auto and cross spectra between these maps and publicly available WMAP and Planck maps at frequencies from 23 to 353 GHz. We evaluate the joint likelihood of the spectra versus a multicomponent model of lensed-ΛCDM+r+dust+synchrotron+noise. The foreground model has seven parameters, and we impose priors on some of these using external information from Planck and WMAP derived from larger regions of sky. The model is shown to be an adequate description of the data at the current noise levels. The likelihood analysis yields the constraint r_{0.05}<0.07 at 95% confidence, which tightens to r_{0.05}<0.06 in conjunction with Planck temperature measurements and other data. The lensing signal is detected at 8.8σ significance. Running a maximum likelihood search on simulations we obtain unbiased results and find that σ(r)=0.020. These are the strongest constraints to date on primordial gravitational waves.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Phys Rev Lett Year: 2018 Document type: Article
Fulltext
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Phys Rev Lett Year: 2018 Document type: Article