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Интеллектуальная Система Тематического Исследования НАукометрических данных |
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Cosmological Scenarios with Bounce and Genesis in Horndeski Theory and Beyondстатья
- Авторы: Volkova V.E., Mironov S.A., Rubakov V.A.
- Журнал: Journal of Experimental and Theoretical Physics
- Том: 129
- Номер: 4
- Год издания: 2019
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 553
- Последняя страница: 565
- DOI: 10.1134/s1063776119100236
- Аннотация: This essay is a brief review of the recent studies of non-singular cosmological scenarios with bounce and Genesis and their stability in a subclass of scalar–tensor theories with higher derivatives—beyond Horndeski theories. We discuss the general results of stability analysis of the nonsingular cosmological solutions in beyond Horndeski theories, as well as other closely related topics: 1) the no-go theorem, which is valid in the general Horndeski theories but not in their extensions, 2) singularities in disformal transformations relating beyond Horndeski theories with general ones, 3) healthy behavior of the scalar sector in the unitary gauge despite divergencies of coefficients in the quadratic action for perturbations (“γ-crossing”). We describe several specific examples of bouncing cosmologies and models with Genesis epoch which have neither ghosts nor gradient instabilities among the linearized perturbations about the homogeneous isotropic background during entire evolution.
- Добавил в систему: Арыджан Юлия Абдуррахмановна