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arXiv 1707.02259astro-ph.CO
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用CORE探索宇宙起源:CMB的引力透镜效应

Exploring cosmic origins with CORE: gravitational lensing of the CMB

Anthony Challinor, Rupert Allison, Julien Carron, Josquin Errard, Stephen Feeney, Thomas Kitching, Julien Lesgourgues, Antony Lewis, Íñigo Zubeldía, Ana Achucar… 展开作者

Anthony Challinor, Rupert Allison, Julien Carron, Josquin Errard, Stephen Feeney, Thomas Kitching, Julien Lesgourgues, Antony Lewis, Íñigo Zubeldía, Ana Achucarro, Peter Ade, Mark Ashdown, Mario Ballardini, A. J. Banday, Ranajoy Banerji, James Bartlett, Nicola Bartolo, Soumen Basak, Daniel Baumann, Marco Bersanelli, Anna Bonaldi, Matteo Bonato, Julian Borrill, François Bouchet, François Boulanger, Thejs Brinckmann, Martin Bucher, Carlo Burigana, Alessandro Buzzelli, Zhen-Yi Cai, Martino Calvo, Carla-Sofia Carvalho, Gabriella Castellano, Jens Chluba, Sebastien Clesse, Ivan Colantoni, Alessandro Coppolecchia, Martin Crook, Giuseppe d'Alessandro, Paolo de Bernardis, Giancarlo de Gasperis, Gianfranco De Zotti, Jacques Delabrouille, Eleonora Di Valentino, Jose-Maria Diego, Raul Fernandez-Cobos, Simone Ferraro, Fabio Finelli, Francesco Forastieri, Silvia Galli, Ricardo Genova-Santos, Martina Gerbino, Joaquin González-Nuevo, Sebastian Grandis, Joshua Greenslade, Steffen Hagstotz, Shaul Hanany, Will Handley, Carlos Hernandez-Monteagudo, Carlos Hervías-Caimapo, Matthew Hills, Eric Hivon, Kimmo Kiiveri, Ted Kisner, Martin Kunz, Hannu Kurki-Suonio, Luca Lamagna, Anthony Lasenby, Massimiliano Lattanzi, Michele Liguori, Valtteri Lindholm, Marcos López-Caniego, Gemma Luzzi, Bruno Maffei, Enrique Martinez-González, C. J. A. P. Martins, Silvia Masi, Darragh McCarthy, Alessandro Melchiorri, Jean-Baptiste Melin, Diego Molinari, Alessandro Monfardini, Paolo Natoli, Mattia Negrello, Alessio Notari, Alessandro Paiella, Daniela Paoletti, Guillaume Patanchon, Michel Piat, Giampaolo Pisano, Linda Polastri, Gianluca Polenta, Agnieszka Pollo, Vivian Poulin, Miguel Quartin, Mathieu Remazeilles, Matthieu Roman, Jose-Alberto Rubino-Martin, Laura Salvati, Andrea Tartari, Maurizio Tomasi, Denis Tramonte, Neil Trappe, Tiziana Trombetti, Carole Tucker, Jussi Valiviita, Rien Van de Weijgaert, Bartjan van Tent, Vincent Vennin, Patricio Vielva, Nicola Vittorio, Karl Young, Mario Zannoni

摘要:

宇宙微波背景辐射的透镜效应现在是一个发展良好的探测大规模团簇的广泛的红移范围。通过利用CMB偏振中的非高斯透镜印记,CORE任务可以产生几乎整个天空的透镜偏转的清晰地图。在这个地图中的高S/N模式的数量将超过目前的CMB透镜地图的40倍,测量将是样本方差限制在线性理论是有效的所有尺度。在这里,我们总结了这个任务产品,并讨论了它将使科学。例如,中微子的总质量将被确定为17 meV的准确度,结合CORE透镜和CMB两点信息与同期的BAO测量,比中微子振荡允许的最小总质量小三倍。在用CORE从原始引力波中寻找B模偏振的过程中,透镜诱导的B模将在仪器噪声中占主导地位,限制了对引力波功率谱振幅的限制。利用CORE重建的透镜,可以在内部“去除”观察到的偏振,将透镜B模式功率降低60%。通过结合CORE的透镜和CIB测量,这提高到70%,与无透镜相比(在零假设中),引力波振幅的误差减少了2.5。CORE的透镜测量将允许校准它将发现的40000个星系团的晕质量,并受到基于干净偏振的估计器的约束。CORE可以精确地从CMB地图上删除银河系的辐射,它有19个频率通道。我们目前的初步研究结果表明,残留的银河前景污染将不会是一个显着的偏差源与CORE透镜功率谱测量。[删节]

英文摘要:

Lensing of the CMB is now a well-developed probe of large-scale clustering over a broad range of redshifts. By exploiting the non-Gaussian imprints of lensing in the polarization of the CMB, the CORE mission can produce a clean map of the lensing deflections over nearly the full-sky. The number of high-S/N modes in this map will exceed current CMB lensing maps by a factor of 40, and the measurement will be sample-variance limited on all scales where linear theory is valid. Here, we summarise this mission product and discuss the science that it will enable. For example, the summed mass of neutrinos will be determined to an accuracy of 17 meV combining CORE lensing and CMB two-point information with contemporaneous BAO measurements, three times smaller than the minimum total mass allowed by neutrino oscillations. In the search for B-mode polarization from primordial gravitational waves with CORE, lens-induced B-modes will dominate over instrument noise, limiting constraints on the gravitational wave power spectrum amplitude. With lensing reconstructed by CORE, one can "delens" the observed polarization internally, reducing the lensing B-mode power by 60%. This improves to 70% by combining lensing and CIB measurements from CORE, reducing the error on the gravitational wave amplitude by 2.5 compared to no delensing (in the null hypothesis). Lensing measurements from CORE will allow calibration of the halo masses of the 40000 galaxy clusters that it will find, with constraints dominated by the clean polarization-based estimators. CORE can accurately remove Galactic emission from CMB maps with its 19 frequency channels. We present initial findings that show that residual Galactic foreground contamination will not be a significant source of bias for lensing power spectrum measurements with CORE. [abridged]

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