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We show the relation between Traschen's integral equations and the energy,and ``position of the centre of mass'', of the matter perturbations in aRobertson-Walker spacetime. When the perturbations are ``localised'' we get aset of integral constraints that includes hers. We illustrate them on a simpleexample.Comment: 19 pages, Tex file, submitted to Classical and Quantum Gravit

Integral constraints on cosmological perturbations and their energy