Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 1, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2021/01/031
Keywords
cosmological parameters from CMBR; weak gravitational lensing
Funding
- NSF [AST-1513618, AST-1907657, AST-1814971]
- STFC Ernest Rutherford Fellowship [ST/M004856/2]
- STFC [ST/S00033X/1]
- Horizon 2020 ERC Starting Grant [849169]
- National Research Foundation of South Africa
- U.S. National Science Foundation [AST-0408698, AST-0965625, AST-1440226]
- Princeton University
- University of Pennsylvania
- Canada Foundation for Innovation (CFI) award
- Comision Nacional de Investigacion Cientifica y Tecnologica de Chile (CONICYT)
- CFI under Compute Canada
- Government of Ontario
- Ontario Research Fund | Research Excellence
- University of Toronto
- Office of Science of the U.S. Department of Energy [DE-AC02-05CH11231]
- Simons Foundation
- NASA [NNX13AE56G, NNX14AB58G]
- Mishrahi Fund
- Wilkinson Fund
- [PHY-0855887]
- [PHY-1214379]
- STFC [ST/M004856/2, ST/N004019/1, ST/S00033X/1] Funding Source: UKRI
- European Research Council (ERC) [849169] Funding Source: European Research Council (ERC)
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The study presents Lambda CDM cosmological parameter constraints obtained from delensed microwave background power spectra, revealing internal consistency within the framework of the standard cosmological model. It also demonstrates that the shift in cosmological parameters between delensed and lensed spectra is predicted to be zero when fitting with the correct model, indicating a consistent gravitational lensing effect on the microwave background.
We present Lambda CDM 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 8.7a (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 Lambda CDM 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 Lambda CDM 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.
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