Kinetic Axion f(R) Gravity Phase Space
Oikonomou V.K. Fronimos F.P. Razina O. Tsyba P.
October 2023Multidisciplinary Digital Publishing Institute (MDPI)
Symmetry
2023#15Issue 10
In this work, we studied the phase space of (Formula presented.) 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 (Formula presented.) 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 (Formula presented.) gravity contains all of the cosmological fixed points that can characterize all of the known evolution eras of our universe.
CMB , early acceleration , early universe , f(R) gravity , inflation , modified gravity , primordial universe
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Department of Physics, Aristotle University of Thessaloniki, Thessaloniki, 54124, Greece
L.N. Gumilyov Eurasian National University, Astana, 010008, Kazakhstan
Department of Physics
L.N. Gumilyov Eurasian National University
10 лет помогаем публиковать статьи Международный издатель
Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026