超光速平行暗能量
Tachyonic Teleparallel Dark Energy
摘要：
遥平行引力是广义相对论的一个等价表述，其中使用扭转标量$T$代替里奇标量$R$来表示拉格朗日密度。最近，Geng等人在（Geng et al.，2011年）。他们增加了精粹标量场，在平行引力的拉格朗日量中也允许与引力的非最小耦合，并发现这样的非最小耦合的精粹理论比广义相对论框架中的相同理论具有更丰富的结构。在扭转引力的框架下，我们对快子远程平行暗能量感兴趣，其中标量场是暗能量的来源。我们发现这种非最小耦合快子引力可以实现有效物态方程的幻影分界线的跨越。使用数值计算，我们显示这样的行为的模型明确。
英文摘要：
Teleparallel gravity is an equivalent formulation of general relativity in which instead of the Ricci scalar $R$, one uses the torsion scalar $T$ for the Lagrangian density. Recently teleparallel dark energy has been proposed by Geng et al. in (Geng et al., 2011). They have added quintessence scalar field, allowing also a non-minimal coupling with gravity in the Lagrangian of teleparallel gravity and found that such a non-minimally coupled quintessence theory has a richer structure than the same one in the frame work of general relativity. In the present work we are interested in tachyonic teleparallel dark energy in which scalar field is responsible for dark energy in the frame work of torsion gravity. We find that such a non-minimally coupled tachyon gravity can realize the crossing of the phantom divide line for the effective equation of state. Using the numerical calculations we display such a behavior of the model explicitly.
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