Introducing the Dirac-Milne universe

TL;DR

The paper explores the Dirac-Milne universe, an unconventional matter-antimatter symmetric cosmology with negative gravitational mass for antimatter, which addresses key cosmological problems without dark components.

Contribution

It introduces and analyzes the Dirac-Milne universe model, demonstrating its potential to explain cosmological observations without dark matter or dark energy.

Findings

Linear scale factor evolution solves age and horizon problems.

Model fits Type Ia Supernovae distance data.

Acoustic scale of CMB emerges naturally at degree scale.

Abstract

The \Lambda CDM standard model, although an excellent parametrization of the present cosmological data, requires two as yet unobserved components, Dark Matter and Dark Energy, for more than 95% of the Universe. Faced to this unsatisfactory situation, we study an unconventional cosmology, the Dirac-Milne universe, a matter-antimatter symmetric cosmology, in which antimatter is supposed to present a negative active gravitational mass. The main feature of this cosmology is the linear evolution of the scale factor with time which directly solves the age and horizon problems of a matter-dominated universe. We study the concordance of this model to the cosmological test of Type Ia Supernov\ae\ distance measurements and calculate the theoretical primordial abundances of light elements for this cosmology. We also show that the acoustic scale of the Cosmic Microwave Background naturally emerges at the degree scale despite an open geometry.