Late time cosmological dynamics with a nonminimal extension of the mimetic matter scenario
Late time cosmological dynamics with a nonminimal extension of the mimetic matter scenario
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DOI：
10.1140/epjp/i2018-11876-4
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发表时间：
2018-02
期刊：
影响因子：
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通讯作者：
N. Hosseinkhan;K. Nozari
中科院分区：
文献类型：
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作者：
N. Hosseinkhan;K. Nozari
我们研究了一个扩展的模仿重力，其中模仿的物质是非极小耦合的Ricci标量。我们推导了背景场方程，并表明，作为最小的情况下，非最小的模拟物质可以表现为暗物质或暗能量。采用一些著名的势函数，详细研究了标度因子和状态方程参数的动力学性质。作为有效的模拟暗能量，该模型解释了晚时间宇宙加速，其状态方程参数跨越了幻影鸿沟。我们扩展我们的分析动力系统的方法和相空间轨迹的模型。我们得到了一条吸引子线，它对应于晚时间宇宙加速。通过将这种非最小模拟物质情景与LCDM的观测数据进行比较，我们发现该模型的置信水平与LCDM模型中Planck 2015 TT，TE，EE + Low P + Lensing + BAO数据的置信水平重叠。
We investigate an extension of mimetic gravity in which mimetic matter is nonminimally coupled to the Ricci scalar. We derive the background field equations and show that, as the minimal case, the nonminimal mimetic matter can behave as dark matter or dark energy. By adopting some well-known potentials, we study the dynamics of the scale factor and the equation of state parameter in detail. As the effective mimetic dark energy, this model explains the late time cosmic acceleration and its equation of state parameter crosses the phantom divide. We extend our analysis to the dynamical system approach and the phase space trajectories of the model. We obtain an attractor line which corresponds to the late time cosmic acceleration. By comparing this nonminimal mimetic matter scenario with observational data for the LCDM, we show that the confidence levels of this model overlap with those of Planck 2015 TT, TE, EE + Low P + Lensing + BAO data in the LCDM model.