Dark Matter & Dark Energy from a single scalar field: CMB spectrum and matter transfer function

TL;DR

This paper proposes modifications to the dual axion model to reconcile its predictions with galaxy data while maintaining consistency with CMB observations, enabling testable future predictions.

Contribution

It introduces a modified dual axion model that aligns with galaxy transfer function data without losing fit to CMB data, addressing previous anomalies.

Findings

Modified DAM fits galaxy transfer function data

Maintains compatibility with CMB spectrum

Provides testable predictions for future observations

Abstract

The dual axion model (DAM), yielding bot DM and DE form a PQ-like scalar field solving the strong CP problem, is known to allow a fair fit of CMB data. Recently, however, it was shown that its transfer function exhibits significant anomalies, causing difficulties to fit deep galaxy sample data. Here we show how DAM can be modified to agree with the latter data set. The modification follows the pattern suggested to reconcile any PQ-like approach with gravity. Modified DAM allows precise predictions which can be testable against future CMB and/or deep sample data.