BICEP / Keck XVII: Line of Sight Distortion Analysis: Estimates of Gravitational Lensing, Anisotropic Cosmic Birefringence, Patchy Reionization, and Systematic Errors
Creators: name: Keck Collaboration
name: Ade, P. A. R.
name: Ahmed, Z.
name: Amiri, M.
name: Barkats, D.
name: Thakur, R. Basu
name: Beck, D.
name: Bischoff, C. A.
name: Bock, J. J.
name: Boenish, H.
name: Bullock, E.
name: Buza, V.
name: Cheshire, J. R.
name: Connors, J.
name: Cornelison, J.
name: Crumrine, M.
name: Cukierman, A.
name: Denison, E. V.
name: Dierickx, M.
name: Duband, L.
name: Eiben, M.
name: Fatigoni, S.
name: Filippini, J. P.
name: Fliescher, S.
name: Giannakopoulos, C.
name: Goeckner-Wald, N.
name: Goldfinger, D. C.
name: Grayson, J.
name: Grimes, P.
name: Halal, G.
name: Hall, G.
name: Halpern, M.
name: Hand, E.
name: Harrison, S.
name: Henderson, S.
name: Hildebrandt, S. R.
name: Hubmayr, J.
name: Hui, H.
name: Irwin, K. D.
name: Kang, J.
name: Karkare, K. S.
name: Karpel, E.
name: Kefeli, S.
name: Kernasovskiy, S. A.
name: Kovac, J. M.
name: Kuo, C. L.
name: Lau, K.
name: Leitch, E. M.
name: Lennox, A.
name: Megerian, K. G.
name: Minutolo, L.
name: Moncelsi, L.
name: Nakato, Y.
name: Namikawa, T.
name: Nguyen, H. T.
name: O'Brient, R.
name: Ogburn, R. W.
name: Palladino, S.
name: Petroff, M. A.
name: Prouve, T.
name: Pryke, C.
name: Racine, B.
name: Reintsema, C. D.
name: Richter, S.
name: Schillaci, A.
name: Schmitt, B. L.
name: Schwarz, R.
name: Sheehy, C. D.
name: Singari, B.
name: Soliman, A.
name: Germaine, T. St
name: Steinbach, B.
name: Sudiwala, R. V.
name: Teply, G. P.
name: Thompson, K. L.
name: Tolan, J. E.
name: Tucker, C.
name: Turner, A. D.
name: Umilta, C.
name: Verges, C.
name: Vieregg, A. G.
name: Wandui, A.
name: Weber, A. C.
name: Wiebe, D. V.
name: Willmert, J.
name: Wong, C. L.
name: Wu, W. L. K.
name: Yang, H.
name: Yoon, K. W.
name: Young, E.
name: Yu, C.
name: Zeng, L.
name: Zhang, C.
name: Zhang, S.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We present estimates of line-of-sight distortion fields derived from the 95 GHz and 150 GHz data taken by BICEP2, BICEP3, and Keck Array up to the 2018 observing season, leading to cosmological constraints and a study of instrumental and astrophysical systematics. Cosmological constraints are derived from three of the distortion fields concerning gravitational lensing from large-scale structure, polarization rotation from magnetic fields or an axion-like field, and the screening effect of patchy reionization. We measure an amplitude of the lensing power spectrum $A_L^{ϕϕ}=0.95 \pm 0.20$. We constrain polarization rotation, expressed as the coupling constant of a Chern-Simons electromagnetic term $g_{aγ} \leq 2.6 \times 10^{-2}/H_I$, where $H_I$ is the inflationary Hubble parameter, and an amplitude of primordial magnetic fields smoothed over 1 Mpc $B_{1\text{Mpc}} \leq 6.6 \;\text{nG}$ at 95 GHz. We constrain the root mean square of optical-depth fluctuations in a simple "crinkly surface" model of patchy reionization, finding $A^τ&lt;0.19$ ($2σ$) for the coherence scale of $L_c=100$. We show that all of the distortion fields of the 95 GHz and 150 GHz polarization maps are consistent with simulations including lensed-$Λ$CDM, dust, and noise, with no evidence for instrumental systematics. In some cases, the EB and TB quadratic estimators presented here are more sensitive than our previous map-based null tests at identifying and rejecting spurious B-modes that might arise from instrumental effects. Finally, we verify that the standard deprojection filtering in the BICEP/Keck data processing is effective at removing temperature to polarization leakage.
description: 34 pages, 19 figures, accepted for publication in The Astrophysical Journal