The Stochastic Gravitational-Wave Background and the Inflation to Radiation Transition in the Early Universe

Details The Stochastic Gravitational-Wave Background and the Inflation to Radiation Transition in the Early Universe The Stochastic Gravitational-Wave Background and the Inflation to Radiation Transition in the Early Universe

2003-09-18

arxiv.org/abs/astro-ph/0309508v2

Class.Quant.Grav.21:3057,2004; Erratum-ibid.24:6431-6434,2007

Astronomy and Astrophysics

Astrophysics

14 pages, 4 figures, An error was found in the original version leading to changes in the figures. The interesting features in

Scientific paper

10.1088/0264-9381/21/12/015 10.1

In this paper we calculate the gravitational-wave power-spectra corresponding to different types of transitions between the inflationary regime and the radiation era. We study four cases, where inflation is followed by a stiff matter phase, or by a dust dominated phase, or by a combination of the two, before the universe enters the radiation era. Use is made of differential equations for the Bogoliubov coefficients, allowing us to model all the transitions between the different eras as continuous. New features appear, for frequencies above 10^{7} rad/s in an otherwise flat part of the spectrum.

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