Spectra of perturbations produced by double inflation with an intermediate matter-dominated stage
Abstract
The spectra of adiabatic perturbations generated in a realistic double-inflationary model with two massive scalar fields is calculated, including the case when mh>>ml and there exists an intermediate power-law regime a(t)α t2/3 between the two phases of inflation. In the latter case, the spectrum has a non-flat step-like behaviour in terms of the quantity k3/2Φ(k) where Φ is a r.m.s. gravitational potential, with larger amplitude at large scales. Transition from the upper plateau to the lower one goes through a very short period of fall-off α k-3 (modulated by oscillations) followed by a k-1 behaviour and, finally, by a fall-off α k-5.5 until the lower plateau is reached. The spectrum of gravitational waves produced in this model is found, too. It has a different structure in the transition region between the two plateaus. Back reaction of generated inhomogeneities on the background is considered in the case of the power-law regime.
Permanent address: Landau Institute for Theoretical Physics Russian Academy of Sciences, Moscow 117334, Russian Federation.- Publication:
-
Nuclear Physics B
- Pub Date:
- October 1992
- DOI:
- 10.1016/0550-3213(92)90062-G
- Bibcode:
- 1992NuPhB.385..623P