Planck Collaboration; Ade, P. A. R.; Aghanim, N.; Armitage-Caplan, C.; Arnaud, M.; Ashdown, M.; Atrio-Barandela, F.; Aumont, J.; Baccigalupi, C.; Banday, A. J.; Barreiro, R. B.; Bartlett, J. G.; Basak, S.; Battaner, E.; Benabed, K.; Benoît, A.; Benoit-Lévy, A.; Bernard, J.-P.; Bersanelli, M.; Bielewicz, P.; Bobin, J.; Bock, J. J.; Bonaldi, A.; Bonavera, L.; Bond, J. R.; Borrill, J.; Bouchet, F. R.; Bridges, M.; Bucher, M.; Burigana, C.; Butler, R. C.; Cardoso, J.-F.; Catalano, A.; Challinor, A.; Chamballu, A.; Chiang, H. C.; Chiang, L.-Y.; Christensen, P. R.; Church, S.; Clements, D. L.; Colombi, S.; Colombo, L. P. L.; Couchot, F.; Coulais, A.; Crill, B. P.; Curto, A.; Cuttaia, F.; Danese, L.; Davies, R. D.; Davis, R. J.; de Bernardis, P.; de Rosa, A.; de Zotti, G.; Déchelette, T.; Delabrouille, J.; Delouis, J.-M.; Désert, F.-X.; Dickinson, C.; Diego, J. M.; Dole, H.; Donzelli, S.; Doré, O.; Douspis, M.; Dunkley, J.; Dupac, X.; Efstathiou, G.; Enßlin, T. A.; Eriksen, H. K.; Finelli, F.; Forni, O.; Frailis, M.; Franceschi, E.; Galeotta, S.; Ganga, K.; Giard, M.; Giardino, G.; Giraud-Héraud, Y.; González-Nuevo, J.; Górski, K. M.; Gratton, S.; Gregorio, A.; Gruppuso, A.; Gudmundsson, J. E.; Hansen, F. K.; Hanson, D.; Harrison, D.; Henrot-Versillé, S.; Hernández-Monteagudo, C.; Herranz, D.; Hildebrandt, S. R.; Hivon, E.; Ho, S.; Hobson, M.; Holmes, W. A.; Hornstrup, A.; Hovest, W.; Huffenberger, K. M.; Jaffe, A. H.; Jaffe, T. R.; Jones, W. C. et al.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 571, id.A17, 39 pp.
Fecha de publicación:
11
2014
Número de autores del IAC
2
Número de citas referidas
355
Descripción
On the arcminute angular scales probed by Planck, the cosmic microwave
background (CMB) anisotropies are gently perturbed by gravitational
lensing. Here we present a detailed study of this effect, detecting
lensing independently in the 100, 143, and 217 GHz frequency bands with
an overall significance of greater than 25σ. We use
thetemperature-gradient correlations induced by lensing to reconstruct a
(noisy) map of the CMB lensing potential, which provides an integrated
measure of the mass distribution back to the CMB last-scattering
surface. Our lensing potential map is significantly correlated with
other tracers of mass, a fact which we demonstrate using several
representative tracers of large-scale structure. We estimate the power
spectrum of the lensing potential, finding generally good agreement with
expectations from the best-fitting ΛCDM model for the Planck
temperature power spectrum, showing that this measurement at z = 1100
correctly predicts the properties of the lower-redshift, later-time
structures which source the lensing potential. When combined with the
temperature power spectrum, our measurement provides degeneracy-breaking
power for parameter constraints; it improves CMB-alone constraints on
curvature by a factor of two and also partly breaks the degeneracy
between the amplitude of the primordial perturbation power spectrum and
the optical depth to reionization, allowing a measurement of the optical
depth to reionization which is independent of large-scale polarization
data. Discarding scale information, our measurement corresponds to a 4%
constraint on the amplitude of the lensing potential power spectrum, or
a 2% constraint on the root-mean-squared amplitude of matter
fluctuations at z ~ 2.
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