  The curvaton scenario for the generation of the cosmological curvature
perturbation on large scales represents an alternative to the standard
slow-roll scenario of inflation in which the observed density perturbations are
due to fluctuations of the inflaton field itself. Its basic assumption is that
the initial curvature perturbation due to the inflaton field is negligible.
This is attained by lowering the energy scale of inflation, thereby highly
suppressing the amount of gravitational waves produced during inflation. We
compute the power-spectrum of the gravitational waves generated at second order
in perturbation theory by the curvaton (isocurvature) perturbations between the
end of inflation and the curvaton decay. An interesting property of this
contribution to the tensor perturbations is that it is directly proportional to
the amount of non-Gaussianity predicted within the curvaton scenario. We show
that the spectrum of gravitational waves may be in the range of future
gravitational wave detectors.
