The effect of the cosmological constant on background gravitational waves

Abstract

The effect of a non-zero cosmological constant on the power spectrum of background gravitational waves is investigated. The power spectra of models with and without a non-zero cosmological constant are compared, and measurable differences between the models are identified. In particular, the power spectrum for non-zero cosmological constant is 0.3–0.6 times lower than the models with a zero constant for large-scale gravitational waves, yet identical at the super-horizon scale.