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We present a new approach to the question of properly defining energy andmomenta for non asymptotically Minkowskian spaces in general relativity, in thecase where these energy and momenta are conserved. In order to do this, wefirst prove that there always exist some special Gauss coordinates for whichthe conserved linear and angular three-momenta vanish. This allows us toconsider the case of creatable universes (the universes whose proper 4-momentavanish) in a consistent way, which is the main interest of the paper. Whenapplied to the Friedmann-Lema{\^{\i}}tre-Robertson-Walker case, perturbed ornot, our formalism leads to previous results, according to most literature onthe subject. Some future work that should be done is mentioned.

Intrinsic vanishing of energy and momenta in a universe