Summary
Mass and spin are derived for a class of exact solutions of the Poincaré gauge (PG) theory of gravity, provided the curvature fulfills a modified double-duality ansatz. We execute a (3 + l)-decomposition and clarify and simplify the structure of the energy-momentum and spin complexes. In case the quadratic PG Lagrangian contains the curvaturesquare pieces in the Yang-Mills fashion, the (3 + l)-decomposition provides rather detailed information on admissible solutions. The PG energymomentum complex turns out to be intimately related to the von Freud complex of general relativity.
Riassunto
Si derivano la massa e lo spin per una classe delle soluzioni esatte della teoria di gravità del gauge di Poincaré (PG), purché la curvatura soddisfi un ansatz modifïcato con doppia dualità. Si esegue una decomposizione 3 + 1 e si chiarifica e semplifïca la struttura dell–energia-impulso e i complessi di spin. Nel caso in cui la Lagrangiana PG quadrata contiene le porzioni a curvatura quadrata secondo Yang-Mills, la decomposizione 3 + 1 fornisce informazioni abbastanza dettagliate su soluzioni ammissibili. Il complesso energia-impulso PG risulta essere intimamente connesso con il complesso di von Freud della relativité générale.
Резюме
Определяются масса и спин для класса точных решений калибровочной теории Пуанкаре для гравитации. Мы проводим (3 + 1)-разложение и упрощаем структуру энергетически-импул ьсных и спиновых комплексов. В этом случае квадратичный Лагранжиан калибровочной теории Пуанкаре содержит куски с квадратичной кривизной в методе Янга-Миллса, (3 + 1)-разложение обеспечивает довольно подробную информацию о допустимых решениях. Kомплекс энергииимпульса в калибровочной теории Пуанкаре оказывается тесно связанным с комплексом фон Фрейда общей теории относительности.
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Supported by the Deutsche Forschungsgemeinschaft, Bonn, project He 528/9-2.
Supported by the Alexander von Humboldt Foundation, Bonn.
An erratum to this article is available at http://dx.doi.org/10.1007/BF02728788.
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Mielke, E.W., Wallner, R.P. Mass and spin of double dual solutions in Poincaré gauge theory. Nuov Cim B 101, 607–624 (1988). https://doi.org/10.1007/BF02748964
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DOI: https://doi.org/10.1007/BF02748964