The Atacama Cosmology Telescope: Delensed Power Spectra and Parameters
arXiv:2007.14405
Abstract
We present LCDM cosmological parameter constraints obtained from delensed microwave background power spectra. Lensing maps from a subset of DR4 data from the Atacama Cosmology Telescope (ACT) are used to undo the lensing effect in ACT spectra observed at 150 and 98 GHz. At 150 GHz, we remove the lensing distortion with an effective efficiency of 30% (TT), 30% (EE), 26% (TE) and 20% (BB); this results in detections of the delensing effect at 8.7 sigma (TT), 5.1 sigma (EE), 2.6 sigma (TE), and 2.4 sigma (BB) significance. The combination of 150 and 98 GHz TT, EE, and TE delensed spectra is well fit by a standard LCDM model. We also measure the shift in best-fit parameters when fitting delensed versus lensed spectra; while this shift does not inform our ability to measure cosmological parameters, it does provide a three-way consistency check among the lensing inferred from the best-fit parameters, the lensing in the CMB power spectrum, and the reconstructed lensing map. This shift is predicted to be zero when fitting with the correct model since both lensed and delensed spectra originate from the same region of sky. Fitting with a LCDM model and marginalizing over foregrounds, we find that the shift in cosmological parameters is consistent with zero. Our results show that gravitational lensing of the microwave background is internally consistent within the framework of the standard cosmological model.
arXiv comment29 pages, 17 figures, version matches that accepted by JCAP
References in corpus (49)
- Planck 2015 results. XIII. Cosmological parameters
- Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
- Nine-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Parameter Results
- Efficient Computation of CMB anisotropies in closed FRW models
- Cosmological parameters from CMB and other data: a Monte-Carlo approach
- The Simons Observatory: Science goals and forecasts
- Weak Gravitational Lensing of the CMB
- Why your model parameter confidences might be too optimistic -- unbiased estimation of the inverse covariance matrix
- Mass Reconstruction with CMB Polarization
- Gravitational Lensing Effect on Cosmic Microwave Background Polarization
- A limit on the detectability of the energy scale of inflation
- The Atacama Cosmology Telescope: Temperature and Gravitational Lensing Power Spectrum Measurements from Three Seasons of Data
- Gravitational lensing as a contaminant of the gravity wave signal in CMB
- The Atacama Cosmology Telescope: The polarization-sensitive ACTPol instrument
- Separation of Gravitational-Wave and Cosmic-Shear Contributions to Cosmic Microwave Background Polarization
- Cosmic Microwave Weak lensing data as a test for the dark universe
- Simulations of the Microwave Sky
- Reconstructing Projected Matter Density from Cosmic Microwave Background
- The Atacama Cosmology Telescope: likelihood for small-scale CMB data
- Delensing CMB Polarization with External Datasets
- The Atacama Cosmology Telescope: Two-Season ACTPol Lensing Power Spectrum
- The Atacama Cosmology Telescope: A CMB lensing mass map over 2100 square degrees of sky and its cross-correlation with BOSS-CMASS galaxies
- The Atacama Cosmology Telescope: Component-separated maps of CMB temperature and the thermal Sunyaev-Zel'dovich effect
- Evidence of Lensing of the Cosmic Microwave Background by Dark Matter Halos
- Libsharp - spherical harmonic transforms revisited
- Primordial power spectrum from Planck
- First Measurement of the Cross-Correlation of CMB Lensing and Galaxy Lensing
- Full covariance of CMB and lensing reconstruction power spectra
- Cluster Mass Estimators from CMB Temperature and Polarization Lensing
- CMB Delensing Beyond the B Modes
- Internal delensing of Planck CMB temperature and polarization
- Demonstration of cosmic microwave background delensing using the cosmic infrared background
- On the joint analysis of CMB temperature and lensing-reconstruction power spectra
- Non-Gaussian structure of the lensed CMB power spectra covariance matrix
- Fundamental Physics from Future Weak-Lensing Calibrated Sunyaev-Zel'dovich Galaxy Cluster Counts
- Search for Compensated Isocurvature Perturbations with Planck Power Spectra
- Weak Lensing Detection in CMB Maps
- Internal delensing of Cosmic Microwave Background polarization B-modes with the POLARBEAR experiment
- Super-Sample CMB Lensing
- Internal Delensing of Cosmic Microwave Background Acoustic Peaks
- Lensing Simulation and Power Spectrum Estimation for High Resolution CMB Polarization Maps
- Planck residuals anomaly as a fingerprint of alternative scenarios to inflation
- CMB internal delensing with general optimal estimator for higher-order correlations
- Baryons still trace dark matter: probing CMB lensing maps for hidden isocurvature
- Lensing anomaly and oscillations in the primordial power spectrum
- Impact of internal-delensing biases on searches for primordial B-modes of CMB polarisation
- Cosmic Microwave Background Delensing Revisited: Residual Biases and a Simple Fix
- Lensing covariance on cut sky and SPT-Planck lensing tensions
- CMB-HD: Astro2020 RFI Response
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- Delensing the CMB with the cosmic infrared background: the impact of foregrounds
- A numerical study of observational systematic errors in lensing analysis of CMB polarization