Integrable cosmological models with an additional scalar field

We consider modified gravity cosmological models that can be transformed into two-field chiral cosmological models by the conformal metric transformation. For the R 2 gravity model with an additional scalar field and the corresponding two-field model with the cosmological constant and nonstandard ki...

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Bibliographic Details
Published in:The European physical journal. C, Particles and fields Particles and fields, 2021-11, Vol.81 (11), p.1-11, Article 985
Main Authors: Ivanov, Vsevolod R., Vernov, Sergey Yu
Format: Article
Language:English
Subjects:
Analysis
Astronomical models
Astronomy
Astrophysics and Cosmology
Cosmological constant
Cosmology
Dark energy
Elementary Particles
Expanding universe theory
Gravity
Hadrons
Heavy Ions
Measurement Science and Instrumentation
Nuclear Energy
Nuclear Physics
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Regular Article - Theoretical Physics
Scalars
String Theory
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Summary:We consider modified gravity cosmological models that can be transformed into two-field chiral cosmological models by the conformal metric transformation. For the R 2 gravity model with an additional scalar field and the corresponding two-field model with the cosmological constant and nonstandard kinetic part of the action, the general solutions have been obtained in the spatially flat FLRW metric. We analyze the correspondence of the cosmic time solutions obtained and different possible evolutions of the Hubble parameters in the Einstein and Jordan frames.
ISSN:1434-6044
1434-6052
DOI:10.1140/epjc/s10052-021-09792-4