The formalism of invariants in scalar-tensor and multiscalar-tensor theories of gravitation
| Autor: | Laur Järv, Margus Saal, Piret Kuusk, Ott Vilson |
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| Rok vydání: | 2015 |
| Předmět: |
Physics
High Energy Physics - Theory Cosmology and Nongalactic Astrophysics (astro-ph.CO) Scalar (mathematics) FOS: Physical sciences Conformal map Observable General Relativity and Quantum Cosmology (gr-qc) Cosmology General Relativity and Quantum Cosmology Gravitation Formalism (philosophy of mathematics) Theoretical physics High Energy Physics - Theory (hep-th) Invariant (mathematics) Parametrization Astrophysics - Cosmology and Nongalactic Astrophysics |
| DOI: | 10.48550/arxiv.1512.09166 |
| Popis: | We give a brief summary of the formalism of invariants in general scalar-tensor and multiscalar-tensor gravities without derivative couplings. By rescaling of the metric and reparametrization of the scalar fields, the theory can be presented in different conformal frames and parametrizations. Due to this freedom in transformations, the scalar fields themselves do not carry independent physical meaning (in a generic parametrization). However, there are functions of the scalar fields and their derivatives which remain invariant under the transformations, providing a set of physical variables for the theory. We indicate how to construct such invariants and show how the observables like parametrized post-Newtonian parameters and characteristics of Friedmann-Lemaitre-Robertson-Walker cosmology can be neatly expressed in terms of the invariants. Comment: 6 pages; contributed to the proceedings of the 14th Marcel Grossmann Meeting on General Relativity, parallel session AT1 |
| Databáze: | OpenAIRE |
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