相互作用快子的加速宇宙学模型
Accelerating Cosmological Models for an Interacting Tachyon
摘要：
研究了具有Dirac- Born- Infeld型拉格朗日量和势V（T）的快子标量场T与具有任意但可因子化的相互作用势B（T，φ）的正则归一化标量场耦合的正压流体的宇宙演化.我们假定正压流体与标量场之间的力仅为引力，并证明了所有模型的依赖关系都是由三个参数：L1= -V_T/V，L2= -B_T/B和L3= -B_phi/B给出的，这三个参数是场和时间依赖的。我们给出了宇宙运动方程的一般解，并确定在何种情况下，我们可以有一个加速宇宙产生暗能量。
英文摘要：
We study the cosmological evolution of a tachyon scalar field T with a Dirac- Born- Infeld type lagrangian and potential V (T) coupled to a canonically normalized scalar field with an arbitrary but factorizeable interaction potential B (T,phi) in the presence of a barotropic fluid. We will assume that the force between the barotropic fluid and the scalar field is only gravitational and we show that all models dependence is given in terms of three parameters: L1= -V_T/V, L2= -B_T/B and L3= -B_phi/B which are field and time dependent. We give the general solution to the cosmological equations of motion and determine in which cases we can have an accelerating universe giving rise to dark energy.
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