Gauge-mediated curvature of the flat directions during preheating

Gia Dvali, Antonio Riotto

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Usually one expects the inflaton field to be coupled to some gauge-charged particles allowing for its decay during reheating. Such particles then play the role of messengers for the gauge-mediated supersymmetry breaking during and (shortly) after the inflation and radiatively induce soft masses to all other D-flat directions. We show that during the preheating stage this gauge-mediated soft masses are typically much greater than the Hubble parameter during inflation. The dramatic role is played by the supersymmetry (SUSY) breaking due to the parametric resonance effect, which ensures that the inflaton predominantly decays into the bosons and not the fermions. The difference in the Fermi-Bose occupation numbers results in the large gauge-mediated soft masses, which determine the post-inflationary evolution of the flat directions, suggesting that non-thermal phase transitions mediated by gauge messengers may play a crucial role in the Affleck-Dine mechanism for the generation of the baryon asymmetry.

    Original languageEnglish (US)
    Pages (from-to)247-252
    Number of pages6
    JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
    Volume388
    Issue number2
    DOIs
    StatePublished - Nov 14 1996

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics

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