期刊
EUROPEAN PHYSICAL JOURNAL C
卷 79, 期 8, 页码 -出版社
SPRINGER
DOI: 10.1140/epjc/s10052-019-7149-x
关键词
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资金
- Atraccion del Talento Cientifico en Salamanca programme
- MINECO [FIS2014-52837-P, FIS2016-78859-P]
- Spanish Ministry of Economy and Competitiveness [FPU15/05406]
- Spanish project (MINECO/FEDER, EU) [FIS2014-57387-C3-1-P]
- H2020-MSCA-RISE-2017 Grant [FunFiCO-777740]
- Generalitat Valenciana [SEJI/2017/042]
- Consolider Program [CPANPHY-1205388]
- Severo Ochoa Grant (Spain) [SEV-2014-0398]
- COST (European Cooperation in Science and Technology) [CA15117]
We disprove the widespread belief that higher order curvature theories of gravity in the metric-affine formalism are generally ghost-free. This is clarified by considering a sub-class of theories constructed only with the Ricci tensor and showing that the non-projectively invariant sector propagates ghost-like degrees of freedom. We also explain how these pathologies can be avoided either by imposing a projective symmetry or additional constraints in the gravity sector. Our results put forward that higher order curvature gravity theories generally remain pathological in the metric-affine (and hybrid) formalisms and highlight the key importance of the projective symmetry and/or additional constraints for their physical viability and, by extension, of general metric-affine theories.
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