Is PLANCK consistent with primordial deuterium measurements ?

TL;DR

This paper examines a tension between primordial deuterium measurements and Planck CMB data within the standard cosmological model, exploring potential new physics like anomalous lensing or a closed universe to reconcile the differences.

Contribution

It identifies specific extensions to the DM model that could resolve the tension between deuterium measurements and Planck data.

Findings

Anomalous lensing can improve consistency.

A closed universe model also helps reconcile data.

Standard DM remains in tension with deuterium measurements.

Abstract

The recent measurements of the Cosmic Microwave Background Anisotropies provided by the Planck satellite experiment have significantly improved the constraints on several cosmological parameters. In this brief paper we point out a small but interesting tension present between recent values of the primordial deuterium measured from quasar absorption line systems and the same value inferred, albeit indirectly, from the Planck measurements assuming {\Lambda}CDM and Big Bang Nucleosynthesis. Here we discuss this tension in detail investigating the possible new physics that could be responsible for the tension. We found that, among 8 extra parameters, only an anomalous lensing component and a closed universe could change the Planck constraint towards a better consistency with direct deuterium measurements.