Do we live in a "Dirac-Milne" universe?

Understand

The LCDM 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, and a high level of fine-tuning.

• 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.
• We show that this universe remarkably satisfies the cosmological tests for the age of the Universe, Big-Bang Nucleosynthesis, and Type Ia Supernovae data.
• Most surprisingly, it also provides the degree scale for the first acoustic peak of the Cosmological Microwave Background.