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Referencias:

• Landau, L.D., Lifshitz, E.M., (1975) The Classical Theory of Fields, , Pergamon, New York
• P. A. M. Dirac, Lectures on Quantum Mechanics, Belfer Graduate School of Science Monograph Series Number Two (Yeshiva University, New York, 1964); A. Hanson, T. Regge, and C. Teitelboim, Constrained Hamiltonian Systems (Academia Nazionale dei Lincei, Roma, 1976); Castagnino, M., Ferraro, R., (1986) Phys. Rev. D, 34, p. 497
• We shall restrict ourselves to the space-time manifolds that admit such a foliation; It does not necessarily coincide with the proper time of the fluid elements; It can be shown that this condition implies that the Vmu for the varied trajectory stay orthogonal to vmu; The ``extra'' minus signs are due to the signature chosen for the metric (see Sec. IV, pμ=-gμν m dxν/ds, so the energy is positive for the free particle); This equation can be obtained also from a variational principle minimizing the action. In this case we should take into account the constraint (16). It can be seen that the associated Lagrange multiplier is null; Weinberg, S., (1972) Gravitation and Cosmology: Principles and Applications of the General Theory of Relativity, , Wiley, New York

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