Tensions in cosmological parameters measurement motivate a revisit of the effects of instrumental systematics. In this article, we focus on the Pearson's correlation coefficient of the cosmic microwave background temperature and polarization E modes RℓTE which has the property of not being biased by multiplicative instrumental systematics. We build a RℓTE-based likelihood for the Planck data, and present the first constraints on ΛCDM parameters from the correlation coefficient. Our results are compatible with parameters derived from a power spectra based likelihood. In particular the value of the Hubble parameter H0 characterizing the expansion of the Universe today, 67.5 ± 1.3 km/s/Mpc, is consistent with the ones inferred from standard CMB analysis. We also discuss the consistency of the Planck correlation coefficient with the one computed from the most recent ACTPol power spectra.
@article{arxiv.2105.06167,
title = {Cosmology with Planck T-E correlation coefficient},
author = {Adrien La Posta and Thibaut Louis and Xavier Garrido and Matthieu Tristram and Sophie Henrot-Versillé},
journal= {arXiv preprint arXiv:2105.06167},
year = {2021}
}