CMB power spectra and cosmological parameters from Planck PR4 with CamSpec

TL;DR

This paper uses the new Planck PR4 NPIPE maps to derive angular power spectra and cosmological parameters, confirming the robustness of Planck cosmology and tightening constraints with improved data processing.

Contribution

It introduces new versions of the CamSpec likelihood based on NPIPE maps and demonstrates their impact on cosmological parameter estimation.

Findings

Excellent consistency between NPIPE and Planck 2018 maps at the parameter level

10% tighter constraints due to lower noise in NPIPE maps

Shift towards LCDM values for parameters like Omega_K and A_Lens

Abstract

We present angular power spectra and cosmological parameter constraints derived from the Planck PR4 (NPIPE) maps of the Cosmic Microwave Background. NPIPE, released by the Planck Collaboration in 2020, is a new processing pipeline for producing calibrated frequency maps from Planck data. We have created new versions of the CamSpec likelihood using these maps and applied them to constrain LCDM and single-parameter extensions. We find excellent consistency between NPIPE and the Planck 2018 maps at the parameter level, showing that the Planck cosmology is robust to substantial changes in the mapmaking. The lower noise of NPIPE leads to ~10% tighter constraints, and we see both smaller error bars and a shift toward the LCDM values for beyond-LCDM parameters including Omega_K and A_Lens.