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Sneutrino condensate source for density perturbations, leptogenesis and low reheat temperature

Research output: Contribution to journalJournal article


Article number251301
Journal publication date24/06/2004
JournalPhysical Review Letters
Number of pages40
Original languageEnglish


We bring together some known ingredients beyond the Standard Model physics which can explain the hot Big Bang model with the observed baryon asymmetry and also the fluctuations in the cosmic microwave background radiation with a minimal set of assumptions. We propose an interesting scenario where the inflaton energy density is dumped into an infinitely large extra dimension. Instead of the inflaton it is the right handed sneutrino condensate, which is acquiring non-zero vacuum expectation value during inflation, whose fluctuations are responsible for the density perturbations seen in the cosmic microwave background radiation with a spectral index $n_s\approx 1$. The decay of the condensate is explaining the reheating of the Universe with a temperature, $T_{rh}\leq 10^{9}$ GeV, and the baryon asymmetry of order one part in $10^{10}$ with no baryon-isocurvature fluctuations.

Bibliographic note

© 2004 The American Physical Society 4 pages, Title has been modified, trivial changes to match accepted version in Phys. Rev. Lett