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 √〈χ2〉max≈2×1017 GeV for g≲1×10-5, which is larger than the minimally coupled case with g≈1×10-3.
|ジャーナル||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|出版物ステータス||Published - 1999 9 15|
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)