Leptogenesis from a sneutrino condensate revisited

Abstract

We re--examine leptogenesis from a right--handed sneutrino condensate, paying special attention to the $B-$term associated with the see--saw Majorana mass. This term generates a lepton asymmetry in the condensate whose time average vanishes. However, a net asymmetry will result if the sneutrino lifetime is not much longer than the period of oscillations. Supersymmetry breaking by thermal effects then yields a lepton asymmetry in the standard model sector after the condensate decays. We explore different possibilities by taking account of both the low--energy and Hubble $B-$terms. It will be shown that the desired baryon asymmetry of the Universe can be obtained for a wide range of Majorana mass.

17 revtex pages, 3 figures, 1 table. Slightly modified and references added. Final version accepted for publication in Phys. Rev. D

References in corpus (6)

• Status of three-neutrino oscillations after the SNO-salt data
• Soft Leptogenesis
• Leptogenesis from Supersymmetry Breaking
• On the reheating stage after inflation
• Constraints on neutrino oscillation parameters from the SNO salt phase data
• Leptogenesis through direct inflaton decay to light particles

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