arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.06214gr-qcastro-ph.CO
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与引力效应非最小导数耦合的全息暗能量

Holographic dark energy with non-minimal derivative coupling to gravity effects

Chonticha Kritpetch, Candrasyah Muhammad, Burin Gumjudpai

摘要:

在全息暗能量的假设下,研究了平坦FLRW宇宙中引力的非最小导数耦合。动力学项耦合到势$V = (1/2)m^2 ϕ^2$下的爱因斯坦张量。自由动力学项允许是正则项和幻影项。用NMDC耦合修正了引力常量。在哈勃视界的全息截止给出了对暗能量密度的修正。我们计算了暗能量的暗能量状态方程和理论中的引力常量的变化,从而使理论得到约束。发现NMDC的正耦合比负耦合更有利。纯NMDC理论和势的模型在正的亚普朗克NMDC耦合和衰减标量场的情况下更有利。在标量势作用下,具有正NMDC耦合的正则标量场在某些条件下也是可行的,这些条件导致振荡的标量场。在这个模型中,幻影场的情况是不受欢迎的,因为耦合和标量质量被要求是超普朗克的,而它被引力常量变化观测严格限制。

英文摘要:

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.

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