Phase-space analysis in non-minimal symmetric-teleparallel dark energy
Carloni Y. Luongo O.
May 2024Springer Nature
European Physical Journal C
2024#84Issue 5
We modify the symmetric-teleparallel dark energy through the addition of a further Yukawa-like term, in which the non-metricity scalar, Q, is non-minimally coupled to a scalar field Lagrangian where the phion acts as quintessence, describing dark energy. We investigate regions of stability and find late-time attractors. To do so, we conduct a stability analysis for different types of physical potentials describing dark energy, namely the power-law, inverse power-law, and exponential potentials. Within these choices, we furthermore single out particular limiting cases, such as the constant, linear and inverse potentials. For all the considered scenarios, regions of stability are calculated in terms of the signs of the coupling constant and the exponent, revealing a clear degeneracy among coefficients necessary to ensure stability. We find that a generic power-law potential with α>0 is not suitable as a non-minimal quintessence potential and we put severe limits on the use of inverse potential, as well. In addition, the equations of state of each potential have been also computed. We find the constant potential seems to be favored than other treatments, since the critical point appears independent of the non-minimal coupling.
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Università di Camerino, Via Madonna delle Carceri, Camerino, 62032, Italy
INAF-Osservatorio Astronomico di Brera, Milan, Italy
SUNY Polytechnic Institute, Utica, 13502, NY, United States
Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Perugia, Perugia, 06123, Italy
Al-Farabi Kazakh National University, Al-Farabi av. 71, Almaty, 050040, Kazakhstan
Università di Camerino
INAF-Osservatorio Astronomico di Brera
SUNY Polytechnic Institute
Istituto Nazionale di Fisica Nucleare (INFN)
Al-Farabi Kazakh National University
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