A coupled generalized three-form dark energy model

Abstract

A coupled dark energy model is considered, in which dark energy is represented by a generalized three-form field and dark matter by dust. By assuming the functions $N$ and $I$ in the model's Lagrangian as two power-law functions of the three-form field, we obtain two fixed points of the autonomous system of evolution equations, consisting of a attractor and a tracking saddle point which can be used to alleviate the coincidence problem. After marginalizing the present three-form field $\kappa X_0$ which is unable to be strictly restricted, we confront the model with the latest Type Ia Supernova (SN \uppercase\expandafter{\romannumeral1}a), Baryon Acoustic Oscillations (BAO) and Cosmic Microwave Backround (CMB) radiation observations with the fitting results ${\Omega }_{m0}=0.280_{-0.048}^{+0.048}$ and $\lambda =0.011_{-0.032}^{+0.032}$ in the $2\sigma$ confidence level, we also find that the best fitting effective dark energy equation of state (EOS) crosses $-1$ at redshift around 0.2.

arXiv comment13 pages, 13 figures, 2 tables, accepted by Physics of the Dark Universe(Volume 27, January 2020, 100462). arXiv admin note: substantial text overlap with arXiv:1704.05772

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Cited by in corpus (1)

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