Inflation with non-canonical scalar fields revisited

Brane World Inflation with Scalar and Tachyon Fields

We present inflationary models of the early universe in the braneworld scenario considering both scalar field and tachyon field separately. The technique of Chervon and Zhuravlev to obtain inflationary cosmological models without restrictions on a scalar field potential is employed here. We note that like scalar field, the inflationary solution obtained here with tachyon field also does not dep...

Correlation of inflation-produced magnetic fields with scalar fluctuations

If the conformal invariance of electromagnetism is broken during inflation, then primordial magnetic fields may be produced. If this symmetry breaking is generated by the coupling between electromagnetism and a scalar field—e.g. the inflaton, curvaton, or Ricci scalar—then these magnetic fields may be correlated with primordial density perturbations, opening a new window to the study of nonGaus...

Preheating with non-minimally coupled scalar fields in higher-curvature inflation models

Takashi Torii ‡ Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152, Japan (June 4, 2005) In higher-curvature inflation models (R + αnR ), we study a parametric preheating of a scalar field χ coupled non-minimally to a spacetime curvature R (ξRχ). In the case of R-inflation model, efficient preheating becomes possible for rather small values of ξ, i.e. |ξ|∼ several. Although...

Resonant particle production with non-minimally coupled scalar fields in preheating after inflation

(June 7, 1999) We investigate a resonant particle production of a scalar field χ coupled non-minimally to a spacetime curvature R (ξRχ) as well as to an inflaton field φ (gφχ). In the case of g ∼ 3×10−4, ξ effect assists g-resonance in certain parameter regimes. However, for g ∼ 3× 10−4, g-resonance is not enhanced by ξ effect because of ξ suppression effect as well as a back reaction effect. I...

Observational Constraints on Non-Canonical Inflation