Key points are not available for this paper at this time.
Using recently derived integral constraints, the authors give a general-relativistic proof of the k4 power spectrum for perturbations generated by local, causal processes in a Robertson-Walker universe. If galactic clusters formed from such fluctuations and if light traces mass, then in order to reconcile the integral constraints with observed cluster-cluster correlations, these perturbations must have been created when the age of the universe was greater than a few thousand years. Inflation provides a way out of this bound.
Abbott et al. (Sat,) studied this question.