Simons Observatory: Constraining inflationary gravitational waves with multitracer B-mode delensing

被引：24

作者：

Namikawa, Toshiya ^{[1
,2
]}

Lizancos, Anton Baleato ^{[3
,4
,5
,6
]}

Robertson, Naomi ^{[3
]}

Sherwin, Blake D. ^{[2
,4
]}

Challinor, Anthony ^{[2
,3
,4
]}

Alonso, David ^{[7
]}

Azzoni, Susanna ^{[1
,7
]}

Baccigalupi, Carlo ^{[8
,9
,10
]}

Calabrese, Erminia ^{[11
]}

Carron, Julien ^{[12
]}

Chinone, Yuji ^{[1
,13
]}

Chluba, Jens ^{[14
]}

Coppi, Gabriele ^{[15
]}

Errard, Josquin ^{[16
]}

Fabbian, Giulio ^{[17
,18
]}

Ferraro, Simone ^{[6
]}

Kalaja, Alba ^{[19
]}

Lewis, Antony ^{[20
]}

Madhavacheril, Mathew S. ^{[21
,22
]}

Meerburg, P. Daniel

Meyers, Joel ^{[23
]}

Nati, Federico

Orlando, Giorgio ^{[19
]}

Poletti, Davide ^{[24
,25
]}

Puglisi, Giuseppe ^{[26
,27
]}

Remazeilles, Mathieu ^{[14
]}

Sehgal, Neelima ^{[28
]}

Tajima, Osamu ^{[29
]}

Teply, Grant ^{[30
]}

van Engelen, Alexander ^{[31
]}

Wollack, Edward J. ^{[32
]}

Xu, Zhilei ^{[33
]}

Yu, Byeonghee ^{[5
]}

Zhu, Ningfeng ^{[34
]}

Zonca, Andrea ^{[35
]}

机构：

[1] Univ Tokyo, UTIAS, Kavli Inst Phys & Math Univ WPI, Kashiwa, Chiba 2778583, Japan

[2] Univ Cambridge, Dept Appl Math & Theoret Phys, Wilberforce Rd, Cambridge CB3 0WA, England

[3] Inst Astron, Madingley Rd, Cambridge CB3 0HA, England

[4] Kavli Inst Cosmol Cambridge, Madingley Rd, Cambridge CB3 0HA, England

[5] Univ Calif Berkeley, Berkeley Ctr Cosmol Phys, Dept Phys, Berkeley, CA 94720 USA

[6] Lawrence Berkeley Natl Lab, One Cyclotron Rd, Berkeley, CA 94720 USA

[7] Univ Oxford, Dept Phys, Denys Wilkinson Bldg,Keble Rd, Oxford OX1 3RH, England

[8] Int Sch Adv Studies SISSA, Via Bonomea 265, I-34136 Trieste, Italy

[9] Inst Fundamental Phys Univ IFPU, Via Beirut 2, I-34151 Grignano, TS, Italy

[10] Natl Inst Nucl Phys INFN, Sez Trieste Via Valerio 2, I-34127 Trieste, Italy

[11] Cardiff Univ, Sch Phys & Astron, Cardiff CF24 3AA, Wales

[12] Univ Geneva, Dept Phys Theor & CAP, 24 Quai Ansermet, CH-1211 Geneva 4, Switzerland

[13] Univ Tokyo, Res Ctr Early Univ, Sch Sci, Tokyo 1130033, Japan

[14] Univ Manchester, Jodrell Bank Ctr Astrophys, Dept Phys & Astron, Alan Turing Bldg, Oxford Rd, Manchester M13 9PL, Lancs, England

[15] Univ Milano Bicocca, Dept Phys, Piazza Sci 3, I-20126 Milan, Italy

[16] Univ Paris, CNRS, Astroparticule & Cosmol, F-75013 Paris, France

[17] Flatiron Inst, Ctr Computat Astrophys, 162 5th Ave, New York, NY 10010 USA

[18] Cardiff Univ, Sch Phys & Astron, Cardiff CF24 3AA, Wales

[19] Univ Groningen, Swinderen Inst Particle Phys & Grav, Nijen Borgh 4, NL-9747 AG Groningen, Netherlands

[20] Univ Sussex, Dept Phys & Astron, Brighton BN1 9QH, E Sussex, England

[21] Perimeter Inst, Ctr Univ, Waterloo, ON N2L 2Y5, Canada

[22] Univ Southern Calif, Dept Phys & Astron, Los Angeles, CA 90007 USA

[23] Southern Methodist Univ, Dept Phys, 3215 Daniel Ave, Dallas, TX 75275 USA

[24] Univ Milano Bicocca, I-20126 Milan, Italy

[25] INFN Sez Milano Bicocca, I-20126 Milan, Italy

[26] Univ Roma Tor Vergata, Dipartimento Fis, Via Ric Sci 1, I-00133 Rome, Italy

[27] Lawrence Berkeley Natl Lab, Computat Cosmol Ctr, Berkeley, CA 94720 USA

[28] SUNY Stony Brook, Phys & Astron Dept, Stony Brook, NY 11794 USA

[29] Kyoto Univ, Dept Phys, Kitashirakawa Oiwake Cho, Kyoto 6068502, Japan

[30] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA

[31] Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85287 USA

[32] NASA Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[33] MIT, MIT Kavli Inst, 77 Massachusetts Ave, Cambridge, MA 02139 USA

[34] Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA

[35] Univ Calif San Diego, San Diego Supercomp Ctr, La Jolla, CA 92093 USA

来源：

PHYSICAL REVIEW D | 2022年 / 105卷 / 02期

基金：

欧洲研究理事会; 英国科学技术设施理事会; 欧盟地平线“2020”;

关键词：

GRAVITY-WAVES; POLARIZATION;

D O I：

10.1103/PhysRevD.105.023511

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We introduce and validate a delensing framework for the Simons Observatory (SO), which will be used to improve constraints on inflationary gravitational waves by reducing the lensing noise in measurements of the B modes in CMB polarization. SO will initially observe CMB by using three small aperture telescopes and one large-aperture telescope. While polarization maps from small-aperture telescopes will be used to constrain inflationary gravitational waves, the internal CMB lensing maps used to delens will be reconstructed from data from the large-aperture telescope. Since lensing maps obtained from the SO data will be noise dominated on subdegree scales, the SO lensing framework constructs a template for lensing-induced B modes by combining internal CMB lensing maps with maps of the cosmic infrared background from Planck as well as galaxy density maps from the LSST survey. We construct a likelihood for constraining the tensor-to-scalar ratio r that contains auto and cross spectra between observed B modes and the lensing B-mode template. We test our delensing analysis pipeline on map-based simulations containing survey nonidealities, but that, for this initial exploration, does not include contamination from Galactic and extragalactic foregrounds. We find that the SO survey masking and inhomogeneous and atmospheric noise have very little impact on the delensing performance, and the r constraint becomes sigma(r) approximate to 0.0015 which is close to that obtained from the idealized forecasts in the absence of the Galactic foreground and is nearly a factor of 2 tighter than without delensing. We also find that uncertainties in the external large-scale structure tracers used in our multitracer delensing pipeline lead to bias much smaller than the 1 sigma statistical uncertainties.

引用

页数：21

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