Baryogenesis by B - L generation due to superheavy particle decay

Abstract

We have shown that the $B-L$ generation due to the decay of the thermally produced superheavy fields can explain the Baryon assymmetry in the universe if the superheavy fields are heavier than $10^{13-14}$ GeV. Note that although the superheavy fields have non-vanishing charges under the standard model gauge interactions, the thermally prduced baryon asymmetry is sizable. The $B-L$ violating effective operators induced by integrating the superheavy fields have dimension 7, while the operator in the famous leptogenesis has dimension 5. Therefore, the constraints from the nucleon stability can be easily satisfied.

12 pages, 4 figures, 3 tables

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• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• The Cosmological Parameters 2006

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• Quantum decay in renormalizable field theories: quasiparticle formation, Zeno and anti-Zeno effects
• Spectrum of colour sextet scalars in realistic SO(10) GUT
• High Energy Physics and Cosmology at the Unification Frontier: Opportunities and Challenges in the coming years
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