3 research outputs found
Particle production in the oscillating inflation model
We investigate the particle production of a scalar field coupled to an
inflaton field () in the {\it oscillating inflation}
model, which was recently proposed by Damour and Mukhanov. Although the
fluctuation of the field can be effectively enhanced during a stage of
the oscillating inflation, the maximum fluctuation is suppressed as the
critical value which indicates the scale of the core part of the
inflaton potential decreases, in taking into account the back reaction effect
of created particles. As for the particle production, we find that
larger values of the coupling constant are required to lead to an efficient
parametric resonance with the decrease of , because an effective mass
of inflaton around the minimum of its potential becomes larger. However, it is
possible to generate the superheavy particle whose mass is greater than
GeV, which would result in an important consequence for the GUT
baryogenesis.Comment: 18 pages, 14 figure
Resonant particle production with non-minimally coupled scalar fields in preheating after inflation
We investigate a resonant particle production of a scalar field
coupled non-minimally to a spacetime curvature () as well as
to an inflaton field (). In the case of , effect assists -resonance in certain parameter regimes.
However, for , -resonance is not enhanced by
effect because of suppression effect as well as a back reaction effect.
If , the maximal fluctuation of produced -particle is
GeV for , which is larger than the minimally coupled case with .Comment: 33pages, 12figures. to appear in Physical Review