Resonant particle production with nonminimally coupled scalar fields in preheating after inflation

Shinji Tsujikawa, Keiichi Maeda, Takashi Torii

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We investigate the resonant particle production of a scalar field χ coupled nonminimally to a spacetime curvature R (ξRχ2) as well as to an inflaton field φ(g2φ2χ2). In the case of g≲3×10-4, the ξ effect assists g resonance in certain parameter regimes. However, for g≳3×10-4, g resonance is not enhanced by the ξ effect because of the ξ suppression effect as well as a back reaction effect. If ξ≈-4, the maximal fluctuation of produced χ particles is √〈χ2max≈2×1017 GeV for g≲1×10-5, which is larger than the minimally coupled case with g≈1×10-3.

Original languageEnglish
Pages (from-to)1-19
Number of pages19
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number6
Publication statusPublished - 1999 Sep 15


ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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