Remarks on the Boomerang results, the baryon density and the leptonic asymmetry

Details Remarks on the Boomerang results, the baryon density and the leptonic asymmetry Remarks on the Boomerang results, the baryon density and the leptonic asymmetry

2000-04-28

arxiv.org/abs/astro-ph/0004412v3

Phys.Rev.D62:081301,2000

Astronomy and Astrophysics

Astrophysics

version accepted in Phys. Rev. D as a Rapid Communication

Scientific paper

10.1103/PhysRevD.62.081301

The very recent Boomerang results give an estimate of unprecedented precision of the Cosmic Microwave Background anisotropies on sub--degree scales. A puzzling feature for theoretical cosmology is the low amplitude of the second acoustic peak. Through a qualitative discussion, we argue that a scarcely considered category of flat models, with a leptonic asymmetry, a high baryon density and a low cosmological constant seems to be in very good agreement with the data, while still being compatible with big bang nucleosynthesis and some other observational constraints. Although this is certainly not the only way to explain the data, we believe that these models deserve to be included in forthcoming likelihood analyses.

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