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Cosmological Solutions of Integrable F(R) Gravity Models with an Additional Scalar Fieldстатья
- Авторы: Vernov Sergey, Ivanov Vsevolod
- Журнал: Physical Sciences Forum
- Том: 7
- Номер: 1
- Год издания: 2023
- Издательство: MDPI
- Местоположение издательства: Basel, Switzerland
- Номер статьи: 17
- DOI: 10.3390/ecu2023-14039
- Аннотация: We consider F(R) cosmological models with a scalar field. For the R^2 model in the spatially flat Friedmann–Lemaitre–Robertson–Walker metric, the Ricci scalar R can smoothly change its sign during the evolution if and only if the scalar field is a phantom one. In the Bianchi I metric, the Ricci scalar cannot smoothly change its sign if the corresponding solution is anisotropic at R=0. This result does not depend on the type of the scalar field. In the Bianchi I metric, the general solution of evolution equations has been obtained.
- Добавил в систему: Вернов Сергей Юрьевич