학술논문
A Demonstration of Improved Constraints on Primordial Gravitational Waves with Delensing
Document Type
Working Paper
Author
BICEP/Keck; Collaborations, SPTpol; Ade, P. A. R.; Ahmed, Z.; Amiri, M.; Anderson, A. J.; Austermann, J. E.; Avva, J. S.; Barkats, D.; Thakur, R. Basu; Beall, J. A.; Bender, A. N.; Benson, B. A.; Bianchini, F.; Bischoff, C. A.; Bleem, L. E.; Bock, J. J.; Boenish, H.; Bullock, E.; Buza, V.; Carlstrom, J. E.; Chang, C. L.; Cheshire IV, J. R.; Chiang, H. C.; Chou, T-L.; Citron, R.; Connors, J.; Moran, C. Corbett; Cornelison, J.; Crawford, T. M.; Crites, A. T.; Crumrine, M.; Cukierman, A.; de Haan, T.; Dierickx, M.; Dobbs, M. A.; Duband, L.; Everett, W.; Fatigoni, S.; Filippini, J. P.; Fliescher, S.; Gallicchio, J.; George, E. M.; Germaine, T. St.; Goeckner-Wald, N.; Goldfinger, D. C.; Grayson, J.; Gupta, N.; Hall, G.; Halpern, M.; Halverson, N. W.; Harrison, S.; Henderson, S.; Henning, J. W.; Hildebrandt, S. R.; Hilton, G. C.; Holder, G. P.; Holzapfel, W. L.; Hrubes, J. D.; Huang, N.; Hubmayr, J.; Hui, H.; Irwin, K. D.; Kang, J.; Karkare, K. S.; Karpel, E.; Kefeli, S.; Kernasovskiy, S. A.; Knox, L.; Kovac, J. M.; Kuo, C. L.; Lau, K.; Lee, A. T.; Leitch, E. M.; Li, D.; Lowitz, A.; Manzotti, A.; McMahon, J. J.; Megerian, K. G.; Meyer, S. S.; Millea, M.; Mocanu, L. M.; Moncelsi, L.; Montgomery, J.; Nadolski, A.; Namikawa, T.; Natoli, T.; Netterfield, C. B.; Nguyen, H. T.; Nibarger, J. P.; Noble, G.; Novosad, V.; O'Brient, R.; Ogburn IV, R. W.; Omori, Y.; Padin, S.; Palladino, S.; Patil, S.; Prouve, T.; Pryke, C.; Racine, B.; Reichardt, C. L.; Reintsema, C. D.; Richter, S.; Ruhl, J. E.; Saliwanchik, B. R.; Schaffer, K. K.; Schillaci, A.; Schmitt, B. L.; Schwarz, R.; Sheehy, C. D.; Sievers, C.; Smecher, G.; Soliman, A.; Stark, A. A.; Steinbach, B.; Sudiwala, R. V.; Teply, G. P.; Thompson, K. L.; Tolan, J. E.; Tucker, C.; Turner, A. D.; Umiltà, C.; Veach, T.; Vieira, J. D.; Vieregg, A. G.; Wandui, A.; Wang, G.; Weber, A. C.; Whitehorn, N.; Wiebe, D. V.; Willmert, J.; Wong, C. L.; Wu, W. L. K.; Yang, H.; Yefremenko, V.; Yoon, K. W.; Young, E.; Yu, C.; Zeng, L.; Zhang, C.
Source
Phys. Rev. D 103, 022004 (2021)
Subject
Language
Abstract
We present a constraint on the tensor-to-scalar ratio, $r$, derived from measurements of cosmic microwave background (CMB) polarization $B$-modes with "delensing," whereby the uncertainty on $r$ contributed by the sample variance of the gravitational lensing $B$-modes is reduced by cross-correlating against a lensing $B$-mode template. This template is constructed by combining an estimate of the polarized CMB with a tracer of the projected large-scale structure. The large-scale-structure tracer used is a map of the cosmic infrared background derived from Planck satellite data, while the polarized CMB map comes from a combination of South Pole Telescope, BICEP/Keck, and Planck data. We expand the BICEP/Keck likelihood analysis framework to accept a lensing template and apply it to the BICEP/Keck data set collected through 2014 using the same parametric foreground modelling as in the previous analysis. From simulations, we find that the uncertainty on $r$ is reduced by $\sim10\%$, from $\sigma(r)$= 0.024 to 0.022, which can be compared with a $\sim26\%$ reduction obtained when using a perfect lensing template. Applying the technique to the real data, the constraint on $r$ is improved from $r_{0.05} < 0.090$ to $r_{0.05} < 0.082$ (95\% C.L.). This is the first demonstration of improvement in an $r$ constraint through delensing.
Comment: 23 pages, 11 figures; match published version
Comment: 23 pages, 11 figures; match published version