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dc.contributor.author Oikonomou, Vasilis K.
dc.contributor.author Fronimos, Fotis P.
dc.contributor.author Razina, Olga
dc.contributor.author Tsyba, Pyotr
dc.date.accessioned 2024-09-20T10:15:51Z
dc.date.available 2024-09-20T10:15:51Z
dc.date.issued 2023
dc.identifier.citation Oikonomou, V.K.; Fronimos, F.P.; Razina, O.; Tsyba, P. Kinetic Axion f(R) Gravity Phase Space. Symmetry 2023, 15, 1897. https://doi.org/10.3390/ sym15101897 ru
dc.identifier.issn 2073-8994
dc.identifier.other doi.org/10.3390/sym15101897
dc.identifier.uri http://rep.enu.kz/handle/enu/16761
dc.description.abstract In this work, we studied the phase space of f(R) gravity in the presence of a misalignment axion, including parity violating Chern–Simons terms. We construct the autonomous dynamical system by using appropriate dimensionless variables and find the cosmological attractors of the phase space, which are basically the fixed points of the autonomous dynamical system. We focus on the R 2 model and the misalignment axion potential near the minimum. We demonstrate that the Chern–Simons terms have no effect on the phase space. We found four distinct, possibly unstable fixed points with physical significance. Specifically, we found two identical de Sitter fixed points, one radiation domination fixed point, and one dark matter dominated fixed point. Thus, in the presence of a kinetic misalignment axion, the vacuum f(R) gravity contains all of the cosmological fixed points that can characterize all of the known evolution eras of our universe. ru
dc.language.iso en ru
dc.publisher Symmetry ru
dc.relation.ispartofseries Volume 15 Issue 10;
dc.subject inflation ru
dc.subject modified gravity ru
dc.subject f(R) gravity ru
dc.subject early acceleration ru
dc.subject CMB ru
dc.subject primordial universe ru
dc.subject early universe ru
dc.title Kinetic Axion f (R) Gravity Phase Space ru
dc.type Article ru


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