Recently, Cormier and Holman pointed out that fluctuations of an inflaton field (Formula presented) are significantly enhanced in the model of spinodal inflation with a potential (Formula presented) for which the second derivative (Formula presented) changes sign. As an application of this model, we investigate particle production in the natural inflation model with a potential (Formula presented) by making use of the Hartree approximation. For typical mass scales (Formula presented) GeV and (Formula presented) GeV, we find that the growth of fluctuations relevantly occurs for the initial value of inflaton (Formula presented) Especially for (Formula presented) maximum fluctuations are so large that secondary inflation takes place by produced fluctuations. In this case, the achieved number of e-foldings becomes much larger than in the case where an effect of spinodal instability is neglected.
|Number of pages||1|
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|Publication status||Published - 2000|
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)