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The trivial role of torsion in projective invariant theories of gravity with non-minimally coupled matter fields
2017-11-20T09:18:44+00:002017-11-20T09:08:39+00:00Sergio Pastor Carpi
Alfonso, V. I., Bejarano, C., Beltran Jimenez, J., Olmo, G. J., & Orazi, E. (2017). The trivial role of torsion in projective invariant theories of gravity with non-minimally coupled matter fields. Class. Quantum Gravity, 34(23), 235003–20pp.
We study a large family of metric-affine theories with a projective symmetry, including non-minimally coupled matter fields which respect this invariance. The symmetry is straightforwardly realised by imposing that the connection only enters through the symmetric part of the Ricci tensor, even in the matter sector. We leave the connection completely free (including torsion), and obtain its general solution as the Levi-Civita connection of an auxiliary metric, showing that the torsion only appears as a projective mode. This result justifies the widely used condition of setting vanishing torsion in these theories as a simple gauge choice. We apply our results to some particular cases considered in the literature, including the so-called Eddington-inspired-Born-Infeld theories among others. We finally discuss the possibility of imposing a gauge fixing where the connection is metric compatible, and comment on the genuine character of the non-metricity in theories where the two metrics are not conformally related.
The trivial role of torsion in projective invariant theories of gravity with non-minimally coupled matter fieldsAlfonso, V.I.Bejarano, C.Beltran Jimenez, J.Olmo, G.J.Orazi, E.info:doi/10.1088/1361-6382/aa9151openurl:?ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fhttps%3A%2F%2Freferences.ific.uv.es%2Frefbase%2F&genre=article&atitle=The%20trivial%20role%20of%20torsion%20in%20projective%20invariant%20theories%20of%20gravity%20with%20non-minimally%20coupled%20matter%20fields&title=Classical%20and%20Quantum%20Gravity&stitle=Class.%20Quantum%20Gravity&issn=0264-9381&date=2017&volume=34&issue=23&aulast=Alfonso&aufirst=V.I.&au=Bejarano%2C%20C.&au=Beltran%20Jimenez%2C%20J.&au=Olmo%2C%20G.J.&au=Orazi%2C%20E.&pub=Iop%20Publishing%20Ltd&id=info%3Adoi%2F10.1088%2F1361-6382%2Faa9151&sid=refbase%3AIFICcitekey:Alfonso_etal2017Alfonso, V. I., Bejarano, C., Beltran Jimenez, J., Olmo, G. J., & Orazi, E. (2017). The trivial role of torsion in projective invariant theories of gravity with non-minimally coupled matter fields. Class. Quantum Gravity, 34(23), 235003-20pp.2017JournalArticletextmodified gravitymetric-affine theoriestorsionnon-minimal couplingsurl:http://arxiv.org/abs/1705.03806Iop Publishing LtdEnglish0264-9381Classical and Quantum Gravity2017342323500320