Spectrum of cosmic gravitational wave background

Abstract

Models of string cosmology predict a stochastic background of gravitational waves with a spectrum that is strongly tilted towards high frequencies. I give simple approximate expressions for spectral densities of the cosmic background which can be directly compared with sensitivities of gravitational wave detectors.

Extrapolation formula and one typo corrected. Latex, 6 pages, 2 eps figures

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• The graviton background at early times in string cosmology