Density perturbations with temperature fluctuations around a few percent can exponentially boost the freeze-out of heavy particles, enhancing the spatially averaged lepton asymmetry from leptogenesis and relaxing heavy-neutrino mass constraints.
Baryogenesis via Leptogenesis in an inhomogeneous universe
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We investigate the influence of primordial perturbations of the energy density and space--time metric on the generation of the lepton and baryon asymmetries. In the weak and strong washout regimes baryon isocurvature perturbations with amplitudes of the same order as those of the CMB perturbations are generated on scales of order of the respective Hubble scale. They are, however, completely washed out by baryon and photon diffusion at the later stages of the universe's evolution.
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Leptogenesis in the presence of density perturbations
Density perturbations with temperature fluctuations around a few percent can exponentially boost the freeze-out of heavy particles, enhancing the spatially averaged lepton asymmetry from leptogenesis and relaxing heavy-neutrino mass constraints.