论文标题
全息暗能与重力效应非最小导数耦合
Holographic dark energy with non-minimal derivative coupling to gravity effects
论文作者
论文摘要
在全息暗能量的情况下研究了FLRW Universe的重力的非最小导数耦合（NMDC）。动力学术语在电势V =（1/2）m^2 ϕ^2 $下耦合到爱因斯坦张量。自由动力学术语被允许是规范和幻影。通过NMDC耦合修改重力常数。 Hubble Horizon的全息截止值对暗能量密度进行了修改。我们评估了状态的暗能量方程和理论的重力变化，从而可以约束该理论。发现阳性的NMDC耦合受到青睐，而不是负耦合。具有纯NMDC理论和电势的模型具有阳性的亚平原NMDC耦合和衰减标量场。在标量电势下具有正NMDC耦合的典型标量场在某些条件下也可以生存，从而导致振荡标量场。在此模型中，幻影场病例不受欢迎，因为耦合和标量质量必须为超级普兰克，而它受重力恒定变化观测的严格约束。
Non-minimal derivative coupling (NMDC) to gravity in flat FLRW universe is investigated in the scenario of holographic dark energy. Kinetic term is coupled to the Einstein tensor under potential $V = (1/2)m^2 ϕ^2$. The free kinetic term is allowed to be canonical and phantom. Gravitational constant is modified with the NMDC coupling. Holographic cutoff at Hubble horizon gives modification to dark energy density. We evaluate dark energy equation of state and the variation of gravitational constant of the theory such that the theory can be constrained. It is found that positive NMDC coupling is favored rather than the negative one. The model with purely NMDC theory and the potential is favored with positive sub-Planckian NMDC coupling and decaying scalar field. The canonical scalar field with positive NMDC coupling under the scalar potential is also viable under some conditions that result in oscillating scalar field. The phantom field case is not favored in this model since the coupling and scalar mass are required to be super-Planckian while it is tightly constrained by gravitational constant variation observations.
