https://doi.org/10.1140/epjc/s10052-026-15313-y
Regular Article - Theoretical Physics
Phase space analysis of an exponential model in f(Q) gravity including linear dark-sector interactions
Grupo de Física de Partículas Elementales y Cosmología, Programa de Física, Universidad del Atlántico, Carrera 30 No. 8-49, Puerto Colombia, Atlántico, Colombia
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Received:
14
October
2025
Accepted:
10
January
2026
Published online:
2
February
2026
We present a cosmological analysis of an exponential f(Q) gravity model, within the dynamical systems formalism. Following the method introduced by Böhmer et al. (Universe 9:166, 2023), the modified Friedmann modified equations are successfully reduced to an autonomous system. Given the exponential form of f(Q), the equilibrium conditions result in transcendental equations, which we approximate to identify the critical points. We therefore perform a general stability analysis of these points in terms of the model parameters. Finally, we extend the model by including a linear dark energy-dark matter interaction, where the equilibrium points are found with their stability properties. The model exhibits the three main domination epochs in the Universe, as well as a non-trivial impact on the late-time de Sitter attractor.
© The Author(s) 2026
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