Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-05-29
Phys.Rev. D68 (2003) 083510
Astronomy and Astrophysics
Astrophysics
5 pages, 2 eps figures, references are added. Accepted for publication in Physical Review D
Scientific paper
10.1103/PhysRevD.68.083510
The density perturbations generated when the inflaton decay rate is perturbed by a light scalar field $\chi$ are studied. By explicitly solving the perturbation equations for the system of two scalar fields and radiation, we show that even in low energy-scale inflation nearly scale-invariant spectra of scalar perturbations with an amplitude set by observations are obtained through the conversion of $\chi$ fluctuations into adiabatic density perturbations. We demonstrate that the spectra depend on the average decay rate of the inflaton & on the inflaton fluctuations. We then apply this new mechanism to string cosmologies & generalized Einstein theories and discuss the conditions under which scale-invariant spectra are possible.
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