论文标题
从新的角度来看，Tachyon暗能量模型的动力学系统分析
Dynamical systems analysis of tachyon dark energy model from a new perspective
论文作者
论文摘要
在这项工作中，我们提出了一种新方案，通过考虑黑暗能量方程（EOS）的参数化，使用动力学系统分析研究Tachyon暗能量模型。研究了规范和幻影场动力学。在我们的方法中，我们不需要任何明确形式的tachyon潜力。我们以大约tachyon场的EOS的大致形式开始，而不是潜力。该EOS是出于现象学的动机，并包含一些无量纲参数。使用我们的方法，我们可以构建动态系统，从而导致宇宙的时间演变。我们考虑了EOS的两个不同的参数化，并在详细介绍了相空间动力学。我们的分析表明，EOS的Taylor序列参数化具有严重的宇宙学局限性。我们的建议本质上是通用的，可以应用于其他标量黑暗能量模型。
In this work we present a new scheme to study the tachyon dark energy model using dynamical systems analysis by considering parametrization of the equation of state(EoS) of the dark energy. Both the canonical and phantom field dynamics are investigated. In our method we do not require any explicit form of the tachyon potential. Instead of the potential we start with an approximate form of the EoS of the tachyon field. This EoS is phenomenologically motivated and contains some dimensionless parameters. Using our method we can construct the dynamical system which gives rise to the time evolution of the universe. We have considered two different parametrizations of the EoS and studied the phase space dynamics in details. Our analysis shows Taylor series parametrization of the EoS has serious cosmological limitations. Our proposal is generic in nature and can be applied to other scalar field dark energy models.
