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- W3025450012 endingPage "100594" @default.
- W3025450012 startingPage "100594" @default.
- W3025450012 abstract "An effective Lagrangian approach, partly inspired by Quantum Loop Cosmology (QLC), is presented and formulated in a non flat FLRW space–times, making use of modified gravitational models. The models considered are non generic, and their choice is dictated by the necessity to have at least second order differential equations of motion in a non flat FLRW space–time. This is accomplished by a class of Lagrangian which are not analytic in the curvature invariants, or making use of a mimetic gravitational scalar field. In this paper we want to show that, for some effective models, although the associated generalized Friedmann equation may admit non singular metrics as solutions, the de Sitter space–time is present only for a restricted class, which includes General Relativity and Lovelock gravity. The other models admit pseudo de Sitter solutions, namely FLRW metrics, such that for vanishing spatial curvature looks like flat de Sitter patch, but for non vanishing spatial curvature are regular bounce metrics or, when the spatial curvature is negative, Big-Bang singular metrics." @default.
- W3025450012 created "2020-05-21" @default.
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- W3025450012 date "2020-09-01" @default.
- W3025450012 modified "2023-09-27" @default.
- W3025450012 title "Higher derivative and mimetic models on non flat FLRW space–times" @default.
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- W3025450012 doi "https://doi.org/10.1016/j.dark.2020.100594" @default.
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