CMB lensing reconstruction biases in cross-correlation with large-scale structure probes
| العنوان: | CMB lensing reconstruction biases in cross-correlation with large-scale structure probes |
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| المؤلفون: | Dominic Beck, Antony Lewis, Giulio Fabbian |
| المساهمون: | Institut d'astrophysique spatiale (IAS), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3) |
| المصدر: | JCAP JCAP, 2019, 10, pp.057. ⟨10.1088/1475-7516/2019/10/057⟩ JCAP, 2019, 10 (10), pp.057. ⟨10.1088/1475-7516/2019/10/057⟩ |
| بيانات النشر: | HAL CCSD, 2019. |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | Physics, QB991.L37, COSMIC cancer database, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Cross-correlation, 010308 nuclear & particles physics, Gaussian, Cosmic microwave background, Estimator, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, Galaxy, Computational physics, symbols.namesake, Gravitational lens, QB0980, 0103 physical sciences, symbols, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Bispectrum, Astrophysics - Cosmology and Nongalactic Astrophysics, QB |
| الوصف: | The cross-correlation between cosmic microwave background (CMB) gravitational lensing and large-scale structure tracers will be an important cosmological probe in the coming years. Quadratic estimators provide a simple and powerful (if suboptimal) way to reconstruct the CMB lensing potential and are widely used. For Gaussian fields, the cross-correlation of a quadratic-estimator CMB lensing reconstruction with a tracer is exactly unbiased if the power spectra are known and consistent analytic lensing mode response functions are used. However, the bispectrum induced by non-linear large-scale structure growth and post-Born lensing can introduce an additional bias term ($N_L^{(3/2)}$) in the cross-correlation spectrum, similar to the $N_L^{(3/2)}$ bias in the auto-spectrum demonstrated in recent works. We give analytic flat-sky results for the cross-correlation bias using approximate models for the post-Born and large-scale structure cross-bispectra, and compare with N-body simulation results using ray-tracing techniques. We show that the bias can be at the 5-15\% level in all large-scale structure cross-correlations using small-scale CMB temperature lensing reconstruction, but is substantially reduced using polarization-based lensing estimators or simple foreground-projected temperature estimators. The relative magnitude of these effects is almost three times higher than in the CMB lensing auto-correlation, but is small enough that it can be modelled to sufficient precision using simple analytic models. We show that $N_L^{(3/2)}$ effects in cross-correlation will be detected with high significance when using data of future surveys and could affect systematic effects marginalization in cosmic shear measurements mimicking galaxy intrinsic alignment. Comment: Fixes typo in Eq. A.8 compared to JCAP version. All results unchanged |
| وصف الملف: | application/pdf |
| اللغة: | English |
| تدمد: | 1475-7516 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c407876a47412c1d5ad3b47bf46bac70 https://hal.science/hal-02188780 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....c407876a47412c1d5ad3b47bf46bac70 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 14757516 |
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