Dark energy with zero pressure: Accelerated expansion and large scale structure in action-dependent Lagrangian theories

We develop a cosmological model based on action-dependent Lagrangian theories. The main feature here is the nonconservation of the energy momentum tensor due to the nontrivial geometrical construction of the theory. We provide the basic set of equations necessary to study both the cosmological backg...

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Bibliographic Details
Published in:Physical review. D 2018-11, Vol.98 (10), p.103501, Article 103501
Main Authors: Caramês, Thiago R. P., Velten, H., Fabris, J. C., Lazo, Matheus J.
Format: Article
Language:English
Subjects:
Astronomical models
Cold dark matter
Cold pressing
Computational fluid dynamics
Cosmology
Dark energy
Dark matter
Large scale structure of the universe
Tensors
Universe
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Summary:We develop a cosmological model based on action-dependent Lagrangian theories. The main feature here is the nonconservation of the energy momentum tensor due to the nontrivial geometrical construction of the theory. We provide the basic set of equations necessary to study both the cosmological background expansion as well as the linear matter perturbation growth. We show that the simplest realization of the Universe as described by only one component is not viable as expected from the existing correspondence between this model and the case of viscous cosmological fluids. However, modeling the energy content of the Universe as composed by two pressureless fluids, i.e., one a typical cold dark matter fluid and the other a pressureless “dark energy” fluid which is responsible for driving the late-time acceleration expansion, is qualitatively compatible with observational data.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.98.103501