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Gravitational waves, inflation and the cosmic microwave background: towards testing the slow-roll paradigm

Carlo Ungarelli1, Pierstefano Corasaniti2, R A Mercer1 and Alberto Vecchio1

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One of the fundamental and yet untested predictions of inflationary models is the generation of a very weak cosmic background of gravitational radiation. We investigate the sensitivity required for a space-based gravitational wave laser interferometer with peak sensitivity at ~1 Hz to observe such signal as a function of the model parameters and compare it with indirect limits that can be set with data from present and future cosmic microwave background missions. We concentrate on signals predicted by slow-roll single-field inflationary models and instrumental configurations such as those proposed for the LISA follow-on mission: big bang observer.


PACS

04.30.-w Gravitational waves

95.85.Sz Gravitational radiation, magnetic fields, and other observations

98.80.Es Observational cosmology (including Hubble constant, distance scale, cosmological constant, early Universe, etc)

98.70.Vc Background radiations

MSC

83C35 Gravitational waves

Subjects

Gravitation and cosmology

Astrophysics and astroparticles

Dates

Issue 18 (21 September 2005)

Received 13 April 2005

Published 23 August 2005



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