Generation of cosmological large lepton asymmetry from a rolling scalar field

Abstract

We propose a new scenario to simultaneously explain a large lepton asymmetry and a small baryon asymmetry. We consider a rolling scalar field and its derivative coupling to the lepton number current. The presence of an effective nonzero time derivative of the scalar field leads to $CPT$ violation so that the lepton asymmetry can be generated even in thermal equilibrium as pointed out by Cohen and Kaplan. In this model, the lepton asymmetry varies with time. In particular, we consider the case where it grows with time. The final lepton asymmetry is determined by the decoupling of the lepton number violating interaction and can be as large as order unity. On the other hand, if the decoupling takes place after the electroweak phase transition, a small baryon asymmetry is obtained from the small lepton asymmetry at that time through sphaleron effects. We construct a model in which a rolling scalar field is identified with a quintessence field.

6 pages. Some references are corrected

References in corpus (6)

• Tracking K-essence
• Cosmological constraints from Archeops
• The Cosmic Microwave Background Anisotropy Power Spectrum measured by Archeops
• Effective number of neutrinos and baryon asymmetry from BBN and WMAP
• Spontaneous baryogenesis in warm inflation
• Quintessential Baryogenesis

Cited by in corpus (33)

• Gravitational Leptogenesis and Its Signatures in CMB
• Fermion production during and after axion inflation
• The Curvaton Hypothesis and the eta-problem of Quintessential Inflation, with and without Branes
• Gravitational Leptogenesis and Neutrino Mass Limit
• Spontaneous baryogenesis in flat directions
• Cosmological Evolution of Interacting Dark Energy Models with Mass Varying Neutrinos
• Baryogenesis in a flat direction with neither baryon nor lepton charge
• Asymmetric Dark Matter via Spontaneous Co-Genesis
• Models of Baryogenesis via Spontaneous Lorentz Violation
• Constraint on the Effective Number of Neutrino Species from the WMAP and SDSS LRG Power Spectra
• Cosmological perturbations in a healthy extension of Horava gravity
• Neutrino flavor transformation in the lepton-asymmetric universe
• Light Higgsino from Axion Dark Radiation
• Hubble tension in lepton asymmetric cosmology with an extra radiation
• Do neutrino flavor oscillations forbid large lepton asymmetry of the universe ?
• Asymmetric Dark Matter from Spontaneous Cogenesis in the Supersymmetric Standard Model
• Spontaneous thermal Leptogenesis via Majoron oscillation
• Lepton asymmetry, neutrino spectral distortions, and big bang nucleosynthesis
• Joint constraints on the lepton asymmetry of the Universe and neutrino mass from the Wilkinson Microwave Anisotropy Probe
• Dark Radiation from Modulated Reheating
• A new constraint on primordial lepton flavour asymmetries
• Constraints on neutrino masses from WMAP5 and BBN in the lepton asymmetric universe
• Using Big Bang Nucleosynthesis to Extend CMB Probes of Neutrino Physics
• Multi-angle calculation of the matter-neutrino resonance near an accretion disk
• Lepton asymmetry in the primordial gravitational wave spectrum
• Effect of collisions on neutrino flavor inhomogeneity in a dense neutrino gas
• Large Lepton Asymmetry for Small Baryon Asymmetry and Warm Dark Matter
• Effective chemical potential in spontaneous baryogenesis
• Lepton Flavor Asymmetries: from the early Universe to BBN
• Leptonic Dark Energy and Baryogenesis
• Quintessence, inflation and baryogenesis from a single pseudo-Nambu-Goldstone boson
• B-L-symmetric Baryogenesis with Leptonic Quintessence
• A New Census of the Universe's Entropy