New evidence for lack of CMB power on large scales

TL;DR

This paper presents new evidence indicating a lack of large-scale power in the CMB temperature anisotropy, based on a digitalized map from Planck data showing lower low-multipole amplitudes than WMAP.

Contribution

It introduces a new analysis of Planck data revealing lower large-scale CMB power, challenging previous WMAP results and suggesting potential systematic issues.

Findings

Planck-derived low-l multipoles are significantly lower than WMAP measurements.

Systematic effects are unlikely to account for the observed differences.

The results imply possible new physics or data processing issues affecting large-scale CMB measurements.

Abstract

A digitalized temperature map is recovered from the first light sky survey image published by the Planck team, from which an angular power spectrum is derived. The amplitudes of the low multipoles measured from the preliminary Planck power spectrum are significantly lower than that reported by the WMAP team. Possible systematical effects are far from enough to explain the observed low-l differences.