Summary
A Lagrangian density is built, from which the equations of the gravitational field are deduced in the Newman-Penrose formalism. The use of the Noether theorem enables one to deduce some of the identities which have been used beforehand, in the classification of the Newman-Penrose equations. In the second part of the work, we describe a similar treatment for the electromagnetic field.
Riassunto
Si costruisce una densità lagrangiana da cui si deducono le equazioni del campo gravitazionale nel formalismo di Newman-Penrose. L’uso del teorema di Noether permette di dedurre alcune delle identità che sono state usate in precedenza nella classificazione delle equazioni di Newman-Penrose. Nella seconda parte dell’articolo si descrive un trattamento analogo per il campo elettromagnetico.
Резюме
Строится плотность Лагранжиана, для которой уравнения гравитационного поля выводятся в формализме Ньюмана-Пенроуза. Использование теоремы Ноэтера позволяет вывести некоторые тождества, которые были использованы ранее в классификации уравнений Ньюмана-Пенроуза. Во второй части работы мы описываем аналогичный рецепт для электромагнитного поля.
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References
A. Papapetrou:Ann. Inst. Henry Poincaré,13, 271 (1970)
L. A. Herrera andA. Papapetrou:Compt. Rend., A272, 1756 (1971).
H. Bondi, M. G. J. van der Berg andA. Metzner:Proc. Roy. Soc.,269, 21 (1962).
E. Newman andR. Penrose:Journ. Math. Phys.,3, 566 (1962).
L. A. Herrera: Doc. Thesis, Université de Paris VI (1971).
L. A. Herrera:Compt. Rend., A274, 427 (1972)
Another Lagrangian density, perhaps equivalent to (3.1), is given byM. Carmeli andS. J. Fichler:Phys. Rev. D,5, 290 (1972).
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Herrera, L.A. A gravitational Lagrangian and some identities in the Newman-Penrose formalism. Nuov Cim A 17, 48–54 (1973). https://doi.org/10.1007/BF02790285
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DOI: https://doi.org/10.1007/BF02790285