Trapping effects on inflation
| Autor: | Kin-Wang Ng, Chun Hsien Wu, Wolung Lee, I. Chin Wang |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
High Energy Physics - Theory
Condensed Matter::Quantum Gases Physics Coupling Inflation (cosmology) Nuclear and High Energy Physics Cosmology and Nongalactic Astrophysics (astro-ph.CO) FOS: Physical sciences Spectral density Trapping Inflaton Dissipation Langevin equation High Energy Physics - Theory (hep-th) Colors of noise Quantum electrodynamics Quantum mechanics Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Physical Review D. 84 |
| ISSN: | 1550-2368 1550-7998 |
| DOI: | 10.1103/physrevd.84.063527 |
| Popis: | We develop a Lagrangian approach based on the influence functional method so as to derive self-consistently the Langevin equation for the inflaton field in the presence of trapping points along the inflaton trajectory. The Langevin equation exhibits the backreaction and the fluctuation-dissipation relation of the trapping. The fluctuation is induced by a multiplicative colored noise that can be identified as the the particle number density fluctuations and the dissipation is a new effect that may play a role in the trapping with a strong coupling. In the weak coupling regime, we calculate the power spectrum of the noise-driven inflaton fluctuations for a single trapping point and studied its variation with the trapping location. We also consider a case with closely spaced trapping points and find that the resulting power spectrum is blue. Comment: 13 pages, 2 figures |
| Databáze: | OpenAIRE |
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