标题： 快速.teleparallel暗能量 显示英文标题

标题： Tachyonic Teleparallel Dark Energy

摘要： teleparallel重力是广义相对论的一个等价表述，在其中，我们使用扭率标量$T$替代里奇标量$R$作为拉格朗日密度。最近，Geng等人（Geng等，2011）提出了teleparallel暗能量。他们在teleparallel重力的拉格朗日中加入了正质量项标量场，并允许与引力非最小耦合，发现这种非最小耦合的正质量项理论比广义相对论框架下的相同理论具有更丰富的结构。在目前的工作中，我们关注的是在扭力引力框架下，标量场负责暗能量的tachyon teleparallel暗能量。我们发现这种非最小耦合的tachyon引力可以实现有效状态方程的幻影划分线穿越。通过数值计算，我们明确展示了该模型的这种行为。 显示英文摘要

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.