A connection between Gravitational Scalar-Tensor theories and Generalized Hybrid theories
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arXiv
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| Autori principali: | , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866910085432737792 |
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| author | Ramírez, Jonathan Bergliaffa, Santiago Esteban Perez |
| author_facet | Ramírez, Jonathan Bergliaffa, Santiago Esteban Perez |
| contents | We establish a correspondence between higher-derivative gravitational scalar-tensor theories of the form $Ψ(R,(\nabla R)^2,\Box R)$ and generalized hybrid metric-Palatini models $f(R,\mathcal{R})$. Restricting to the physically relevant case of linear dependence on $\Box R$, we make explicit that both frameworks can be reformulated in the Einstein frame as General Relativity minimally coupled to two interacting scalar fields, thereby opening the possibility of finding theories that are dynamically equivalent. This correspondence provides an explicit dictionary relating the functions that define the higher-derivative theory to the hybrid function $f(R,\mathcal{R})$, allowing for reconstruction in both directions. We illustrate the usefulness of the procedure with explicit examples. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_28497 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | A connection between Gravitational Scalar-Tensor theories and Generalized Hybrid theories Ramírez, Jonathan Bergliaffa, Santiago Esteban Perez General Relativity and Quantum Cosmology We establish a correspondence between higher-derivative gravitational scalar-tensor theories of the form $Ψ(R,(\nabla R)^2,\Box R)$ and generalized hybrid metric-Palatini models $f(R,\mathcal{R})$. Restricting to the physically relevant case of linear dependence on $\Box R$, we make explicit that both frameworks can be reformulated in the Einstein frame as General Relativity minimally coupled to two interacting scalar fields, thereby opening the possibility of finding theories that are dynamically equivalent. This correspondence provides an explicit dictionary relating the functions that define the higher-derivative theory to the hybrid function $f(R,\mathcal{R})$, allowing for reconstruction in both directions. We illustrate the usefulness of the procedure with explicit examples. |
| title | A connection between Gravitational Scalar-Tensor theories and Generalized Hybrid theories |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2603.28497 |