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Dynamics of a two scalar field cosmological model with phantom terms
Classical and Quantum Gravity ( IF 3.5 ) Pub Date : 2021-03-12 , DOI: 10.1088/1361-6382/abe2d7
Andronikos Paliathanasis 1 , Genly Leon 2
Affiliation  

We perform a detailed analysis of the dynamics of a chiral-like cosmological model where the scalar fields can have negative kinetic terms. In particular, we study the asymptotic dynamics for the gravitational field equations for four different models in a spatially flat Friedmann–Lematre–Robertson–Walker (FLRW) background space. When one of the scalar fields is phantom, we show that the cosmological fluid can evolves such that the parameter of the equation of state crosses twice the phantom divide line without the appearance of ghosts. Moreover, the cosmological viability of these four models is discussed.



中文翻译:

具有幻影项的两个标量场宇宙学模型的动力学

我们对标量场可以具有负动力学项的手征样宇宙学模型的动力学进行了详细分析。特别是,我们在空间平坦的Friedmann-Lematre-Robertson-Walker(FLRW)背景空间中研究了四个不同模型的重力场方程的渐近动力学。当标量场之一是幻影时,我们证明宇宙流体可以演化,使得状态方程的参数越过幻影分界线两次,而不会出现幻影。此外,讨论了这四个模型的宇宙学可行性。

更新日期:2021-03-12
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