| Автор | Shinji Tsujikawa |
| Дата выпуска | 2000-07-01 |
| dc.description | We investigate preheating in a higher-dimensional generalized Kaluza-Klein theory with a quadratic inflaton potential V(φ) = ½m<sup>2</sup>φ<sup>2</sup> including metric perturbations explicitly. The system we consider is the multi-field model where there exists a dilaton field σ which corresponds to the scale of compactifications and another scalar field χ coupled to inflaton with the interaction ½g<sup>2</sup>φ<sup>2</sup>χ<sup>2</sup>+g̃<sup>2</sup>φ<sup>3</sup>χ. In the case of g̃ = 0, we find that the perturbation of dilaton does not undergo parametric amplification while the χ field fluctuation can be enhanced in the usual manner by parametric resonance. In the presence of the g̃<sup>2</sup>φ<sup>3</sup>χ coupling, the dilaton fluctuation in sub-Hubble scales is modestly amplified by the growth of metric perturbations for the large coupling g̃. In super-Hubble scales, the enhancement of the dilaton fluctuation as well as metric perturbations is weak, taking into account the backreaction effect of created χ particles. We argue that not only is it possible to predict the ordinary inflationary spectrum in large scales but extra dimensions can be held static during preheating in our scenario. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Preheating with extra dimensions |
| Тип | paper |
| DOI | 10.1088/1126-6708/2000/07/024 |
| Electronic ISSN | 1029- 8479 |
| Print ISSN | 1126-6708 |
| Журнал | Journal of High Energy Physics |
| Том | 2000 |
| Первая страница | 24 |
| Последняя страница | 024 |
| Выпуск | 07 |
