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Cosmology and short-distance gravity

If the observed dark-energy density $ρ_Λ$ is interpreted as the net contribution of the energy density of the vacuum, $ρ_Λ\equiv ρ_V \sim M_V^4$, and the corresponding vacuum length scale $λ_V = M_V^{-1}$ as the cutoff scale controlling the low-energy, effective field-theory limit of gravity, it follows that the conventional cosmological scenario based on the effective gravitational equations may be valid only up to the Tev energy scale. Such a possibility would be strongly disfavored by the existence of a relic background of primordial gravitational radiation of intensity compatible with present (or near future) experimental sensitivities.