Super-Sample CMB Lensing

Abstract

Lensing of the CMB by modes that are larger than the size of the survey dilates intrinsic scales in the temperature and polarization fields and coherently shifts their observed power spectra with respect to the ensemble or all-sky mean. The effect can be simply encapsulated as a contribution to the power spectrum covariance matrix in accordance with the lensing trispectrum or as an additional parameter, the mean convergence in the field, for parameter estimation. It should be included for upcoming surveys that precisely measure acoustic polarization features deep into the damping tail at multipoles of $\ell \gtrsim 1500$ with less than $10\%$ of sky. Its omission may lead to seemingly conflicting values for the angular scale of the sound horizon which may then provide erroneous cosmological parameters when compared to baryon acoustic oscillation measurements.

6 pages, 2 figures

References in corpus (3)

• CMB temperature lensing power reconstruction
• Cosmological Information from Lensed CMB Power Spectra
• Non-Gaussian structure of the lensed CMB power spectra covariance matrix

Cited by in corpus (27)

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• Measurements of the Temperature and E-Mode Polarization of the CMB from 500 Square Degrees of SPTpol Data
• The Atacama Cosmology Telescope: CMB Polarization at $200<\ell <9000$
• Constraints on $\Lambda$CDM Extensions from the SPT-3G 2018 $EE$ and $TE$ Power Spectra
• Accurate cosmic shear errors: do we need ensembles of simulations?
• Complete super-sample lensing covariance in the response approach
• SPT-3G D1: CMB temperature and polarization power spectra and cosmology from 2019 and 2020 observations of the SPT-3G Main field
• Measurements of E-Mode Polarization and Temperature-E-Mode Correlation in the Cosmic Microwave Background from 100 Square Degrees of SPTpol Data
• A measurement of the CMB E-mode angular power spectrum at subdegree scales from 670 square degrees of POLARBEAR data
• Spatial curvature endgame: Reaching the limit of curvature determination
• The impact of large-scale tides on cosmological distortions via redshift-space power spectrum
• Separating the Universe into the Real and Fake
• What does cosmology tell us about the mass of thermal-relic dark matter?
• An optimal survey geometry of weak lensing survey: minimizing super-sample covariance
• Lensing covariance on cut sky and SPT-Planck lensing tensions
• Separate Universe Void Bias
• Separate Universes beyond General Relativity
• Lensed CMB power spectrum biases from masking extragalactic sources
• Quintessential Isocurvature in Separate Universe Simulations
• Impact of nonlinear growth of the large-scale structure on CMB B-mode delensing
• The Atacama Cosmology Telescope: Delensed Power Spectra and Parameters
• Analytic Calculation of Covariance between Cosmological Parameters from Correlated Data Sets, with an Application to SPTpol
• Possible Impact of non-Gaussianities on cosmological constraints in neutrino physics
• Breaking the degeneracy between polarization efficiency and cosmological parameters in CMB experiments
• Scale-dependent halo bias and the squeezed limit bispectrum in the presence of radiation