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Aghanim, N. and Ashdown, M. and Aumont, J. and Baccigalupi, C. and Ballardini, M. and Banday, A.J. and Barreiro, R.B. and Bartolo, N. and Basak, S. and Benabed, K. and Bernard, J.-P. and Bersanelli, M. and Bielewicz, P. and Bonavera, L. and Bond, J.R. and Borrill, J. and Bouchet, F.R. and Burigana, C. and Calabrese, E. and Cardoso, J.-F. and Carron, J. and Chiang, H.C. and Colombo, L.P.L. and Comis, B. and Contreras, D. and Couchot, F. and Coulais, A. and Crill, B.P. and Curto, A. and Cuttaia, F. and de Bernardis, P. and de Rosa, A. and de Zotti, G. and Delabrouille, J. and Désert, F.-X. and Di Valentino, E. and Dickinson, C. and Diego, J.M. and Doré, O. and Ducout, A. and Dupac, X. and Dusini, S. and Elsner, F. and Enßlin, T.A. and Eriksen, H.K. and Fantaye, Y. and Finelli, F. and Forastieri, F. and Frailis, M. and Franceschi, E. and Frolov, A. and Galeotta, S. and Galli, S. and Ganga, K. and Génova-Santos, R.T. and Gerbino, M. and Giraud-Héraud, Y. and González-Nuevo, J. and Górski, K.M. and Gruppuso, A. and Gudmundsson, J.E. and Hansen, F.K. and Henrot-Versillé, S. and Herranz, D. and Hivon, E. and Huang, Z. and Jaffe, A.H. and Jones, W.C. and Keihänen, E. and Keskitalo, R. and Kiiveri, K. and Krachmalnicoff, N. and Kunz, M. and Kurki-Suonio, H. and Lamarre, J.-M. and Langer, M. and Lasenby, A. and Lattanzi, M. and Lawrence, C.R. and Le Jeune, M. and Leahy, J.P. and Levrier, F. and Liguori, M. and Lilje, P.B. and Lindholm, V. and López-Caniego, M. and Ma, Y.-Z. and Macías-Pérez, J.F. and Maggio, G. and Maino, D. and Mandolesi, N. and Maris, M. and Martin, P.G. and Martínez-González, E. and Matarrese, S. and Mauri, N. and McEwen, J.D. and Meinhold, P.R. and Melchiorri, A. and Mennella, A. and Migliaccio, M. and Miville-Deschênes, M.-A. and Molinari, D. and Moneti, A. and Morgante, G. and Moss, Adam and Natoli, P. and Pagano, L. and Paoletti, D. and Patanchon, G. and Patrizii, L. and Perotto, L. and Pettorino, V. and Piacentini, F. and Polastri, L. and Polenta, G. and Rachen, J. P. and Racine, B. and Reinecke, M. and Remazeilles, M. and Renzi, A. and Rocha, G. and Rosset, C. and Rossetti, M. and Roudier, G. and Rubiño-Martín, J.A. and Ruiz-Granados, B. and Sandri, M. and Savelainen, M. and Scott, D. and Sirignano, C. and Sirri, G. and Spencer, L.D. and Suur-Uski, A.-S. and Tauber, J.A. and Tavagnacco, D. and Tenti, M. and Toffolatti, L. and Tomasi, M. and Tristram, M. and Trombetti, T. and Valiviita, J. and Van Tent, F. and Vielva, P. and Villa, F. and Vittorio, N. and Wandelt, B.D. and Wehus, I.K. and Zacchei, A. and Zonca, A. (2016) Planck intermediate results. XLIX. Parity-violation constraints from polarization data. Astronomy & Astrophysics, 596 . A110/1-A110/13. ISSN 1432-0746

Abstract

Parity-violating extensions of the standard electromagnetic theory cause in vacuo rotation of the plane of polarization of propagating photons. This effect, also known as cosmic birefringence, has an impact on the cosmic microwave background (CMB) anisotropy angular power spectra, producing non-vanishing T–B and E–B correlations that are otherwise null when parity is a symmetry. Here we present new constraints on an isotropic rotation, parametrized by the angle α, derived from Planck 2015 CMB polarization data. To increase the robustness of our analyses, we employ two complementary approaches, in harmonic space and in map space, the latter based on a peak stacking technique. The two approaches provide estimates for α that are in agreement within statistical uncertainties and are very stable against several consistency tests.Considering the T–B and E–B information jointly, we find from the harmonic analysis and from the stacking approach. These constraints are compatible with no parity violation and are dominated by the systematic uncertainty in the orientation of Planck’s polarization-sensitive bolometers.

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