Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-02-27
Phys.Rev. D73 (2006) 083511
Astronomy and Astrophysics
Astrophysics
11 pages, 3 figures. Minor amendments. Accepted by Phys. Rev. D
Scientific paper
10.1103/PhysRevD.73.083511
We study the primordial gravitational wave background produced in models of single field inflation. Using the inflationary flow approach, we investigate the amplitude of gravitational wave spectrum in the frequency range 1 mHz - 1 Hz pertinent to future space-based laser interferometers. For models that satisfy the current observational constraint on the tensor-to-scalar ratio, r<0.36, we derive a strict upper bound of omega_{gw}<1.6 x 10^{-15}, independent of the form of the inflationary potential. Applying, in addition, the observational constraints on the spectral index and its running, omega_{gw} is expected to be considerably lower than this bound unless the shape of the potential is finely tuned. We contrast our numerical results with those based on simple power-law extrapolation of the tensor power spectrum from CMB scales. In addition to single field inflation, we summarise a number of other possible cosmological sources of primordial gravitational waves and assess what might be learnt from direct detection experiments such as LISA, Big Bang Observer and beyond.
Chongchitnan Sirichai
Efstathiou George
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