2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/35572In the Lagrangian field theory, one gets different identities for different stress energy-momentum tensors, e.g., canonical energy-momentum tensors. Moreover, these identities are not conservation laws of the above-mentioned energy-momentum tensors in general. In the framework of the multimomentum Hamiltonian formalism, we have the fundamental identity whose restriction to a constraint space can be treated the energy-momentum conservation law. In standard field models, this appears the metric energy-momentum conservation law.21 pp, LaTeX fileGeneral Relativity and Quantum CosmologyHigh Energy Physics - Theorytext