Lepton Asymmetric Universe

Abstract

The recent observation of ${}^4$He implies that our universe has a large lepton asymmetry. We consider the Affleck-Dine (AD) mechanism for lepton number generation. In the AD mechanism, non-topological solitons called L-balls are produced, and the generated lepton number is confined in them. The L-balls protect the generated lepton number from being converted to baryon number through the sphaleron processes. We study the formation and evolution of the L-balls and find that the universe with large lepton asymmetry suggested by the recent ${}^4$He measurement can be realized.

12 pages, 1 figure

References in corpus (7)

• The effects of He I 10830 on helium abundance determinations
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• The PHLEK Survey: A New Determination of the Primordial Helium Abundance
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Cited by in corpus (20)

• EMPRESS. VIII. A New Determination of Primordial He Abundance with Extremely Metal-Poor Galaxies: A Suggestion of the Lepton Asymmetry and Implications for the Hubble Tension
• Indications for a Nonzero Lepton Asymmetry from Extremely Metal-Poor Galaxies
• Primordial lepton asymmetries in the precision cosmology era: Current status and future sensitivities from BBN and the CMB
• Updating non-standard neutrinos properties with Planck-CMB data and full-shape analysis of BOSS and eBOSS galaxies
• Enhancement of gravitational waves at Q-ball decay including non-linear density perturbations
• Constraints on primordial lepton asymmetries with full neutrino transport
• A new constraint on primordial lepton flavour asymmetries
• Large Neutrino Asymmetry from TeV Scale Leptogenesis
• Enhancement of second-order gravitational waves at Q-ball decay
• Gauged Q-ball dark matter through a cosmological first-order phase transition
• Revisiting the Affleck-Dine mechanism for primordial black hole formation
• Big bang nucleosynthesis and early dark energy in light of the EMPRESS $Y_p$ results and the $H_0$ tension
• Variation of the fine structure constant in the light of recent helium abundance measurement
• Lepton Flavor Asymmetries: from the early Universe to BBN
• Pseudo-Dirac Neutrinos and Relic Neutrino Matter Effect on the High-energy Neutrino Flavor Composition
• Linking the $R_{K^{(\ast )}}$ anomalies to the Hubble tension via a single right-handed neutrino
• Chiral gravitational waves from thermalized neutrinos in the early Universe
• Linear seesaw leptogenesis before/after electroweak symmetry breaking
• Big-Bang Nucleosynthesis on a bubble universe nucleated in Kerr-AdS${}_5$ Black Hole
• Primordial Black Holes Formation Beyond the Standard Cosmic QCD Transition