Assessing consistency between CMB temperature and polarization measurements, with application to Planck, ACT and SPT
Planck’s cosmic microwave background temperature and polarization observations are the premier dataset for constraining cosmological models. Cosmic variance limited temperature at large and intermediate scales today dominates the constraints; polarization provides additional constraining power and f...
Published in: | Physical Review D |
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Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
American Physical Society
2023
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Subjects: | |
Online Access: | https://orca.cardiff.ac.uk/id/eprint/156589/ https://doi.org/10.1103/PhysRevD.107.023510 https://orca.cardiff.ac.uk/id/eprint/156589/1/Post-print.pdf |
Summary: | Planck’s cosmic microwave background temperature and polarization observations are the premier dataset for constraining cosmological models. Cosmic variance limited temperature at large and intermediate scales today dominates the constraints; polarization provides additional constraining power and further scrutiny of the models. To complete this picture from Planck, ground-based experiments, such as the Atacama Cosmology Telescope (ACT) and the South Pole Telescope (SPT) continue to add temperature and polarization measurements at small scales, allowing for the extraction of competitive cosmological constraints from the TE and EE power spectra. Matching at the same time all these stringent probes is a key challenge and validation step for any cosmological model. In particular, ΛCDM requires a tight consistency between the temperature and polarization measurements. In this paper, we present a number of methods to identify and quantify possible inconsistencies between temperature and polarization, we apply them to the latest Planck, ACT, and SPT data and find no evidence for a deviation from ΛCDM. Application of these methods will have increased importance for future, more constraining CMB data. |
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