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

Abstract

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.

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

References in corpus (11)

• A Flat Universe from High-Resolution Maps of the Cosmic Microwave Background Radiation
• The Cosmic Triangle: Revealing the State of the Universe
• The HST Key Project on the Extragalactic Distance Scale. XXVIII. Combining the Constraints on the Hubble Constant
• Primordial Nucleosynthesis: Theory and Observations
• New CMB constraints on the cosmic matter budget: trouble for nucleosynthesis?
• Cosmological implications of a Relic Neutrino Asymmetry
• The Small Observed Baryon Asymmetry from a Large Lepton Asymmetry
• Naturally Large Cosmological Neutrino Asymmetries in the MSSM
• Measuring the cosmological lepton asymmetry through the CMB anisotropy
• Neutrino oscillations in the early universe: How large lepton asymmetry can be generated?
• Cosmological measurement of neutrino mass in the presence of leptonic asymmetry

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