A coupled generalized three-form dark energy model

Publication date: Available online 10 January 2020Source: Physics of the Dark UniverseAuthor(s): Yan-Hong Yao, Xin-He MengAbstractA 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 κX0 which is unable to be strictly restricted, we confront the model with the latest Type Ia Supernova (SN Ia), Baryon Acoustic Oscillations (BAO) and Cosmic Microwave Backround (CMB) radiation observations with the fitting results Ωm0=0.280−0.048+0.048 and λ=0.011−0.032+0.032 in the 2σ confidence level, we also find that the best fitting effective dark energy equation of state (EOS) crosses −1 at redshift around 0.2.

Source: Physics of the Dark Universe - January 11, 2020 Category: Physics Source Type: research