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dc.contributor.author | Olmo, Gonzalo J. | es_ES |
dc.contributor.author | Rubiera-García, D. | es_ES |
dc.date.accessioned | 2015-12-03T10:36:18Z | - |
dc.date.available | 2015-12-03T10:36:18Z | - |
dc.date.issued | 2013-09-22 | - |
dc.identifier.citation | Physical Review - Section D - Particles and Fields 88 (8): 084030 - 11 (2013) | es_ES |
dc.identifier.issn | 1550-7998 | - |
dc.identifier.uri | http://hdl.handle.net/10261/126455 | - |
dc.description.abstract | We study the field equations of extensions of general relativity formulated within a metric-affine formalism setting torsion to zero (Palatini approach). We find that different (second-order) dynamical equations arise depending on whether torsion is set to zero (i) a priori or (ii) a posteriori, i.e., before or after considering variations of the action. Considering a generic family of Ricci-squared theories, we show that in both cases the connection can be decomposed as the sum of a Levi-Civita connection and terms depending on a vector field. However, while in case (i) this vector field is related to the symmetric part of the connection, in (ii) it comes from the torsion part and, therefore, it vanishes once torsion is completely removed. Moreover, the vanishing of this torsion-related vector field immediately implies the vanishing of the antisymmetric part of the Ricci tensor, which therefore plays no role in the dynamics. Related to this, we find that the Levi-Civita part of the connection is due to the existence of an invariant volume associated with an auxiliary metric h(mu v), which is algebraically related with the physical metric g(mu v). | es_ES |
dc.description.sponsorship | The work of G. J. O. has been supported by the Spanish Grant No. FIS2011-29813-C02-02 and the JAE-doc program of the Spanish Research Council (CSIC). D. R.-G. is financially supported by CNPq (Brazilian agency) through Grant No. 561069/2010-7, and thanks the theoretical physics group at Valencia University, where part of this work was carried out, for hospitality and partial support. The authors thank L. Fatibene and M. Francaviglia for useful discussions. | es_ES |
dc.language.iso | eng | es_ES |
dc.publisher | American Physical Society | es_ES |
dc.relation.isversionof | Preprint | es_ES |
dc.rights | openAccess | es_ES |
dc.subject | General-relativity | es_ES |
dc.subject | Cosmological constants | es_ES |
dc.title | Importance of torsion and invariant volumes in Palatini theories of gravity | es_ES |
dc.type | artículo | es_ES |
dc.identifier.doi | 10.1103/PhysRevD.88.084030 | - |
dc.description.peerreviewed | Peer reviewed | es_ES |
dc.relation.publisherversion | http://dx.doi.org/10.1103/PhysRevD.88.084030 | es_ES |
dc.identifier.e-issn | 1550-2368 | - |
dc.contributor.funder | Consejo Superior de Investigaciones Científicas (España) | es_ES |
dc.contributor.funder | Universidad de Valencia | es_ES |
dc.contributor.funder | Conselho Nacional de Desenvolvimento Científico e Tecnológico (Brasil) | es_ES |
dc.relation.csic | Sí | es_ES |
dc.identifier.funder | http://dx.doi.org/10.13039/501100003339 | es_ES |
dc.identifier.funder | http://dx.doi.org/10.13039/501100003593 | es_ES |
dc.type.coar | http://purl.org/coar/resource_type/c_6501 | es_ES |
item.openairetype | artículo | - |
item.grantfulltext | open | - |
item.cerifentitytype | Publications | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
item.languageiso639-1 | en | - |
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Importance of torsion.pdf | 249,79 kB | Adobe PDF | Visualizar/Abrir |
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