Summary
Two out of the three sets of field equations associated with Lagrangians quadratic in the Riemann-Christoffel tensor, which were recently discussed by Stephenson, are shown to be equivalent to the source-free Einstein equations with an arbitrary «cosmological» term.
Riassunto
Si dimostra che due dei tre sistemi di equazioni di campo associati a lagrangiani quadratici nel tensore di Riemann-Christoffel, recentemente discussi daStephenson, sono equivalenti alle equazioni di Einstein prive di sorgente con un termine «cosmologico» arbitrario.
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References
G. Stephenson:Nuovo Cimento,9, 263 (1958).
G. Stephenson:Quart. Journ. Math. (Oxford), to be published.
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The work was performed during the tenure of an I.C.I. Research Fellowship.
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Higgs, P.W. Quadratic lagrangians and general relativity. Nuovo Cim 11, 816–820 (1959). https://doi.org/10.1007/BF02732547
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DOI: https://doi.org/10.1007/BF02732547