Reconstruction and exact solutions for cosmological perturbations from a generalized gravity theory

Scalar and tensor cosmological perturbations during an inflationary universe scenario in the context of the a generalized gravity theory are studied. This analyze is carried out considering an ansatz on the variables associated to scalar and tensor perturbation ( z s and z t ) in the Jordan frame. I...

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Bibliographic Details
Published in:	General relativity and gravitation 2020-04, Vol.52 (4), Article 35
Main Authors:	Belinchón, José Antonio, González, Carlos, Herrera, Ramón
Format:	Article
Language:	eng
Subjects:	Astronomy Astrophysics and Cosmology Classical and Quantum Gravitation Context Differential Geometry Exact solutions Gravitation Mathematical and Computational Physics Perturbation Physics Physics and Astronomy Quantum Physics Reconstruction Relativity Theory Research Article Tensors Theoretical
Online Access:	Get full text
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Summary:	Scalar and tensor cosmological perturbations during an inflationary universe scenario in the context of the a generalized gravity theory are studied. This analyze is carried out considering an ansatz on the variables associated to scalar and tensor perturbation ( z s and z t ) in the Jordan frame. In this context, we analyze two different Ansatze for the ratio z s / z t , and we study in great detail the analytical and exact solutions for the cosmological perturbations together with the corresponding reconstruction of the background variables. Recent observational data from the Planck 2018 results are employed to constrain the parameters of each of the models.
ISSN:	0001-7701 1572-9532