https://doi.org/10.1140/epjc/s10052-025-14865-9
Regular Article - Theoretical Physics
Dynamical systems approach and cosmological attractors in newer general relativity
1
Laboratory of Theoretical Physics, Institute of Physics, University of Tartu, W. Ostwaldi 1, 50411, Tartu, Estonia
2
Department of General and Theoretical Physics, L. N. Gumilyov Eurasian National University, Satpayev Str. 2, 010008, Astana, Kazakhstan
Received:
20
June
2025
Accepted:
27
September
2025
Published online:
18
October
2025
We study the cosmological dynamics of a class of symmetric teleparallel gravity theories known as “newer general relativity” using the methods of dynamical systems, restricted to the case of vacuum solutions with a spatially flat Friedmann–Lemaître–Robertson–Walker metric. For the most general class of theories, we study generic properties of the solutions, in particular their fixed points, asymptotic behavior and effective dark energy. We then apply this approach to two phenomenologically motivated subclasses of theories, which we study in full detail. For these theories, we derive the complete space of solutions and cosmological attractors, which we display in a number of phase diagram. Depending on the particular theory at hand, we find different possible scenarios, including a turnaround followed by a big crunch, a big rip and an eternally expanding universe whose Hubble parameter asymptotically approaches zero. It turns that this different behavior can be explained by the effective dark energy barotropic index, which shows either phantom or non-phantom behavior, depending on the theory, but does not change dynamically between these two possibilities.
© The Author(s) 2025
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