https://doi.org/10.1140/epjc/s10052-024-12653-5
Regular Article - Theoretical Physics
Phase-space analysis of torsion-coupled dilatonic ghost condensate
1
Laboratorio de Didáctica de la Física, Departamento de Matemática, Física y Computación, Facultad de Ciencias Naturales y Exactas, Universidad de Playa Ancha, Subida Leopoldo Carvallo 270, Valparaíso, Chile
2
Departamento de Física, Facultad de Ciencias, Universidad de Tarapacá, Casilla 7-D, Arica, Chile
3
Instituto de Física, Pontificia Universidad Católica de Valparaíso, 4950, Casilla, Valparaíso, Chile
4
Laboratorio de investigación de Cómputo de Física, Facultad de Ciencias Naturales y Exactas, Universidad de Playa Ancha, Subida Leopoldo Carvallo 270, Valparaíso, Chile
b
giovanni.otalora@academicos.uta.cl
Received:
19
June
2023
Accepted:
8
March
2024
Published online:
23
March
2024
We studied the cosmological dynamics of a dilatonic ghost condensate field as a source of dark energy, which is non-minimally coupled to gravity through torsion. We performed a detailed phase-space analysis by finding all the critical points and their stability conditions. Also, we compared our results with the latest H(z) and Supernovae Ia observational data. In particular, we found the conditions for the existence of scaling regimes during the dark matter era. Furthermore, we obtained the conditions for a successful exit from the scaling regime, such that, at late times, the universe tends towards an attractor point describing the dark energy-dominated era. These intriguing features can allow us to alleviate the energy scale problem of dark energy since, during a scaling regime, the field energy density is not necessarily negligible at early times.
© The Author(s) 2024
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Funded by SCOAP3.
