We examine the possibility that Friedman-Robertson-Walker evolution is governed by an effective (rather then by the actual) energy density. A concrete example is provided by Regge-Teitelboim cosmology, where critical cosmology only requires subcritical matter density , and the age of a flat matter-dominated universe gets enhanced by a factor of . Dual to the mature dilute universe is the embryo universe, the evolution of both is governed by .
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