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

Julien Lesgourgues, Marco Peloso

Research output: Contribution to journalArticlepeer-review

45 Scopus citations


The very recent Boomerang results give an estimate of unprecedented precision of the cosmic microwave background anisotropies on subdegree 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.

Original languageEnglish (US)
Article number081301
Pages (from-to)1-4
Number of pages4
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number8
StatePublished - 2000


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