Structure of Primordial Gravitational Waves Spectrum in a Double Inflationary Model

Details Structure of Primordial Gravitational Waves Spectrum in a Double Inflationary Model Structure of Primordial Gravitational Waves Spectrum in a Double Inflationary Model

1995-05-27

arxiv.org/abs/astro-ph/9505125v1

Phys.Lett. B356 (1995) 196-204

Astronomy and Astrophysics

Astrophysics

Latex, 10 pages + 4 figures available on request

Scientific paper

10.1016/0370-2693(95)00842-9

The gravitational waves (GW) background generated in a double inflationary model, with two scalar fields mutually interacting through gravity only, and its relative contribution $T/S$ to large-angle temperature fluctuations of the relic microwave background are investigated in detail. The relation between $T/S$ and the slope of the GW spectrum $n_T$ is shown to be a discriminative test between a slow-roll inflation driven by one scalar field and more complicated models. It is found that the GW amplitude is not exactly zero in minima of spectral oscillations, this property being an observational, in principle, manifestation of GW being in a squeezed vacuum state during inflation.

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