학술논문
LiteBIRD Science Goals and Forecasts: Improving Sensitivity to Inflationary Gravitational Waves with Multitracer Delensing
Document Type
Working Paper
Author
Namikawa, T.; Lonappan, A. I.; Baccigalupi, C.; Bartolo, N.; Beck, D.; Benabed, K.; Challinor, A.; Diego-Palazuelos, P.; Errard, J.; Farrens, S.; Gruppuso, A.; Krachmalnicoff, N.; Migliaccio, M.; Martínez-González, E.; Pettorino, V.; Piccirilli, G.; Ruiz-Granda, M.; Sherwin, B.; Starck, J.; Vielva, P.; Akizawa, R.; Anand, A.; Aumont, J.; Aurlien, R.; Azzoni, S.; Ballardini, M.; Banday, A. J.; Barreiro, R. B.; Bersanelli, M.; Blinov, D.; Bortolami, M.; Brinckmann, T.; Calabrese, E.; Campeti, P.; Carones, A.; Carralot, F.; Casas, F. J.; Cheung, K.; Clermont, L.; Columbro, F.; Conenna, G.; Coppolecchia, A.; Cuttaia, F.; D'Alessandro, G.; de Bernardis, P.; de Haan, T.; De Petris, M.; Della Torre, S.; Di Giorgi, E.; Eriksen, H. K.; Finelli, F.; Franceschet, C.; Fuskeland, U.; Galloni, G.; Galloway, M.; Georges, M.; Gerbino, M.; Gervasi, M.; Ghigna, T.; Giardiello, S.; Gimeno-Amo, C.; Gjerløw, E.; Hazumi, M.; Henrot-Versillé, S.; Hergt, L. T.; Hivon, E.; Kohri, K.; Komatsu, E.; Lamagna, L.; Lattanzi, M.; Leloup, C.; Lembo, M.; López-Caniego, M.; Luzzi, G.; Maffei, B.; Masi, S.; Massa, M.; Matarrese, S.; Matsumura, T.; Micheli, S.; Moggi, A.; Monelli, M.; Montier, L.; Morgante, G.; Mot, B.; Mousset, L.; Nagata, R.; Natoli, P.; Novelli, A.; Obata, I.; Occhiuzzi, A.; Pagano, L.; Paiella, A.; Paoletti, D.; Pascual-Cisneros, G.; Pavlidou, V.; Piacentini, F.; Pinchera, M.; Pisano, G.; Polenta, G.; Puglisi, G.; Remazeilles, M.; Ritacco, A.; Rizzieri, A.; Rubino-Martin, J.; Sakurai, Y.; Scott, D.; Shiraishi, M.; Signorelli, G.; Stever, S. L.; Takase, Y.; Tanimura, H.; Tartari, A.; Tassis, K.; Terenzi, L.; Tristram, M.; Vacher, L.; van Tent, B.; Wehus, I. K.; Weymann-Despres, G.; Zannoni, M.; Zhou, Y.
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Abstract
We estimate the efficiency of mitigating the lensing $B$-mode polarization, the so-called delensing, for the $LiteBIRD$ experiment with multiple external data sets of lensing-mass tracers. The current best bound on the tensor-to-scalar ratio, $r$, is limited by lensing rather than Galactic foregrounds. Delensing will be a critical step to improve sensitivity to $r$ as measurements of $r$ become more and more limited by lensing. In this paper, we extend the analysis of the recent $LiteBIRD$ forecast paper to include multiple mass tracers, i.e., the CMB lensing maps from $LiteBIRD$ and CMB-S4-like experiment, cosmic infrared background, and galaxy number density from $Euclid$- and LSST-like survey. We find that multi-tracer delensing will further improve the constraint on $r$ by about $20\%$. In $LiteBIRD$, the residual Galactic foregrounds also significantly contribute to uncertainties of the $B$-modes, and delensing becomes more important if the residual foregrounds are further reduced by an improved component separation method.
Comment: 21 pages, 7 figures
Comment: 21 pages, 7 figures