A flat Universe from high-resolution maps of the cosmic microwave background radiation

P. de Bernardis (), P. A. R. Ade, J. J. Bock, J. R. Bond, J. Borrill, A. Boscaleri, K. Coble, B. P. Crill, G. De Gasperis, P. C. Farese, P. G. Ferreira, K. Ganga, M. Giacometti, E. Hivon, V. V. Hristov, A. Iacoangeli, A. H. Jaffe, A. E. Lange, L. Martinis, S. Masi, P. V. Mason, P. D. Mauskopf, A. Melchiorri, L. Miglio, T. Montroy, C. B. Netterfield, E. Pascale, F. Piacentini, D. Pogosyan, S. Prunet, S. Rao, G. Romeo, J. E. Ruhl, F. Scaramuzzi, D. Sforna and N. Vittorio
Additional contact information
P. de Bernardis: Universita' di Roma “La Sapienza”
P. A. R. Ade: Queen Mary and Westfield College
J. J. Bock: Jet Propulsion Laboratory
J. R. Bond: CITA University of Toronto
J. Borrill: NERSC-LBNL
A. Boscaleri: IROE–CNR
K. Coble: University of California at Santa Barbara
B. P. Crill: California Institute of Technology
G. De Gasperis: Universita' di Roma Tor Vergata
P. C. Farese: University of California at Santa Barbara
P. G. Ferreira: Astrophysics, University of Oxford
K. Ganga: California Institute of Technology
M. Giacometti: Universita' di Roma “La Sapienza”
E. Hivon: California Institute of Technology
V. V. Hristov: California Institute of Technology
A. Iacoangeli: Universita' di Roma “La Sapienza”
A. H. Jaffe: Center for Particle Astrophysics, University of California at Berkeley
A. E. Lange: California Institute of Technology
L. Martinis: ENEA Centro Ricerche di Frascati
S. Masi: Universita' di Roma “La Sapienza”
P. V. Mason: California Institute of Technology
P. D. Mauskopf: Cardiff University
A. Melchiorri: Universita' di Roma “La Sapienza”
L. Miglio: University of Toronto
T. Montroy: University of California at Santa Barbara
C. B. Netterfield: University of Toronto
E. Pascale: IROE–CNR
F. Piacentini: Universita' di Roma “La Sapienza”
D. Pogosyan: CITA University of Toronto
S. Prunet: CITA University of Toronto
S. Rao: Istituto Nazionale di Geofisica
G. Romeo: Istituto Nazionale di Geofisica
J. E. Ruhl: University of California at Santa Barbara
F. Scaramuzzi: ENEA Centro Ricerche di Frascati
D. Sforna: Universita' di Roma “La Sapienza”
N. Vittorio: Universita' di Roma Tor Vergata

Nature, 2000, vol. 404, issue 6781, 955-959

Abstract: Abstract The blackbody radiation left over from the Big Bang has been transformed by the expansion of the Universe into the nearly isotropic 2.73 K cosmic microwave background. Tiny inhomogeneities in the early Universe left their imprint on the microwave background in the form of small anisotropies in its temperature. These anisotropies contain information about basic cosmological parameters, particularly the total energy density and curvature of the Universe. Here we report the first images of resolved structure in the microwave background anisotropies over a significant part of the sky. Maps at four frequencies clearly distinguish the microwave background from foreground emission. We compute the angular power spectrum of the microwave background, and find a peak at Legendre multipole lpeak = (197 ± 6), with an amplitude ΔT200 = (69 ± 8) µK. This is consistent with that expected for cold dark matter models in a flat (euclidean) Universe, as favoured by standard inflationary models.

Date: 2000
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DOI: 10.1038/35010035

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