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A universal Riemannian foliated space

It is proved that the isometry classes of pointed connected complete Riemannian n-manifolds form a Polish space, M∞∗ (n), with the topology described by the C∞ convergence of manifolds. This space has a canonical partition into sets defined by varying the distinguished point into each manifold. The locally nonperiodic manifolds define an open dense subspace M∞ ∗,lnp(n) ⊂ M∞∗ (n), which becomes a C∞ foliated space with the restriction of the canonical partition. Its leaves without holonomy form the subspace M∞∗,np(n) ⊂ M∞∗,lnp(n) defined by the non-periodic manifolds. Moreover the leaves have a natural Riemannian structure so that M∞∗,lnp(n) becomes a Riemannian foliated space, which is universal among all sequential Riemannian foliated spaces satisfying certain property called covering-determination. M∞ ∗,lnp(n) is used to characterize the realization of complete connected Riemannian manifolds as dense leaves of covering-determined compact sequential Riemannian foliated spaces.

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