Spectra of perturbations produced by double inflation with an intermediate matter-dominated stage

Details Spectra of perturbations produced by double inflation with an intermediate matter-dominated stage Spectra of perturbations produced by double inflation with an intermediate matter-dominated stage

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992nuphb.385..623p&link_type=abstract

Nuclear Physics B, Volume 385, Issue 3, p. 623-650.

Physics

Nuclear Physics

162

Scientific paper

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.

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