Year: 2025
Type: preprint
Abstract: Various so-called anomalies have been found in both the WMAP and Planck cosmic microwave background (CMB) temperature data that exert a mild tension against the highly successful best-fit 6 parameter cosmological model, potentially providing hints of new physics to be explored. That these are real features on the sky is uncontested. However, given their modest significance, whether they are indicative of true departures from the standard cosmology or simply statistical excursions, due to a mildly unusual configuration of temperature anisotropies on the sky which we refer to as the "fluke hypothesis", cannot be addressed further without new information. No theoretical model of primordial perturbations has to date been constructed that can explain all of the temperature anomalies. Therefore, we focus in this paper on testing the fluke hypothesis, based on the partial correlation between the temperature and $E$-mode CMB polarisation signal. In particular, we compare the properties of specific statistics in polarisation, built from unconstrained realisations of the $Λ$CDM cosmological model as might be observed by the LiteBIRD satellite, with those determined from constrained simulations, where the part of the $E$-mode anisotropy correlated with temperature is constrained by observations of the latter. Specifically, we use inpainted Planck 2018 SMICA temperature data to constrain the $E$-mode realisations. Subsequent analysis makes use of masks defined to minimise the impact of the inpainting procedure on the $E$-mode map statistics. We find that statistical assessments of the $E$-mode data alone do not provide any evidence for or against the fluke hypothesis. However, tests based on cross-statistical measures determined from temperature and $E$ modes can allow this hypothesis to be rejected with a moderate level of probability.
Source: arXiv (Cornell University)
Authors: Banday, A. J., Gimeno-Amo, C., Diego-Palazuelos, P., de la Hoz, E., Gruppuso, A., Raffuzzi, N., Martínez-González, E., Vielva, P., Barreiro, R. B., Bortolami, M., Chiocchetta, C., Galloni, G., Scott, D., Sullivan, R. M., Adak, D., Allys, E., Anand, A., Aumont, J., Baccigalupi, C., Ballardini, M., Bartolo, N., Basak, S., Bersanelli, M., Besnard, A., Blinov, D., Bouchet, F., Brinckmann, T., Cacciotti, F., Calabrese, E., Campeti, P., Carones, A., Casas, F. J., Cheung, K., Citran, M., Clermont, L., Columbro, F., Coppolecchia, A., de Bernardis, P., De Lucia, M., Della Torre, S., Di Giorgi, E., Eriksen, H. K., Finelli, F., Franceschet, C., Fuskeland, U., Galloway, M., Gervasi, M., Génova-Santos, R. T., Ghigna, T., Giardiello, S., Hazumi, M., Hergt, L. T., Hivon, E., Ichiki, K., Ishino, H., Jost, B., Kohri, K., Lamagna, L., Lattanzi, M., Leloup, C., Levrier, F., Lonappan, A. I., López-Caniego, M., Luzzi, G., Macias-Perez, J., Maranchery, V., Masi, S., Matarrese, S., Matsumura, T., Micheli, S., Migliaccio, M., Monelli, M., Montier, L., Morgante, G., Najafi, M., Namikawa, T., Novelli, A., Obata, I., Occhiuzzi, A., Paiella, A., Paoletti, D., Pascual-Cisneros, G., Piacentini, F., Piccirilli, G., Polenta, G., Porcelli, L., Remazeilles, M., Rizzieri, A., Rubiño-Martín, J. A., Ruiz-Granda, M., Sakurai, Y., Sanghavi, J., Shiraishi, M., Signorelli, G., Takase, Y., Terenzi, L., Tomasi, M., Tristram, M., Vacher, L., van Tent, B., Wehus, I. K., Weymann-Despres, G., Wollack, E. J., Zhou, Y.
Institutions: Institut de Recherche en Astrophysique et Planétologie, Université Paris Diderot, Centre Pierre Binétruy, University of California, Berkeley, École Normale Supérieure - PSL, Laboratoire de Physique de l'Ecole Normale Supérieure, Institut d'Astrophysique Spatiale, Institut d'Astrophysique de Paris, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie, Laboratoire de Physique Subatomique et de Cosmologie
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: National Aeronautics and Space Administration, UK Space Agency, European Commission, Deutsche Forschungsgemeinschaft, Ministry of Education, Culture, Sports, Science and Technology, Swedish National Space Agency, Centro para el Desarrollo Tecnológico Industrial, Centre National d’Etudes Spatiales, Vetenskapsrådet, Centre National de la Recherche Scientifique, Istituto Nazionale di Astrofisica, Norges Forskningsråd, Canadian Space Agency, Japan Society for the Promotion of Science, Japan Aerospace Exploration Agency, Agencia Estatal de Investigación, Nuclear Physics, NextGenerationEU
Awards: G1363707852, G1799927510, 産業モデルの国際的リンケージに関する計量経済学的研究, G3037510059, G318412399, G3367111595, G4066435496, EXC 2094: ORIGINS: Vom Ursprung des Universums bis zu den ersten Bausteinen des Lebens, G4993905653, G5195188938, G5402378781, 「大家族」制展開過程の実証的研究, G6328286017, G6344031981, G6480333962, G6520718613, G6766340963, 古代説話における諸寺縁起の研究, G7942188893, G8670446301
OpenAlex ID: W4415330714