Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-07-17
JCAP 0804:009,2008
Astronomy and Astrophysics
Astrophysics
4 pages, 2 figures
Scientific paper
10.1088/1475-7516/2008/04/009
We study the implications of recent indications for a red spectrum of primordial density perturbations for the detection of inflationary gravitational waves (IGWs) with forthcoming cosmic microwave background experiments. We find that if inflation occurs with a single field with an inflaton potential minimized at V=0, then Planck will be able to detect IGWs at better than 2$\sigma$ confidence level, unless the inflaton potential is a power law with a very weak power. The proposed satellite missions of the Cosmic Vision and Inflation Probe programs will be able to detect IGWs from all the models we have surveyed at better than 5$\sigma$ confidence level. We provide an example of what is required if the IGW background is to remain undetected even by these latter experiments.
Cooray Asantha
Kamionkowski Marc
Melchiorri Alessandro
Pagano Luca
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