论文标题
两场测量理论中k史和动力学重力编织模型的扰动和稳定条件
Perturbations and stability conditions of k-essence and kinetic gravity braiding models in two-field measure theory
论文作者
论文摘要
我们研究了在两场测量理论（TMT）的背景下，研究K效和动力学重力编织模型的宇宙学扰动。考虑到标量扰动和均匀的场量表，我们获得了场的声速，并通过动力学矩阵和质量特征值进行稳定分析。对于K源模型，在两场测量理论中，由于新的测量场而完全修改了该场的传播速度，并且在没有新措施的情况下就造成了有关情况的至关重要的差异。稳定性分析为宇宙提供了物理可行的模型。对于两场测量理论中的动力学重力编织模型，我们得到，通常，扰动的速度等于光速，这是新测量场特性的结果。在后来的情况下，总会有一个幽灵领域。此外，我们计算了质量特征值的一般表达，并在一个明确的例子中找到了速度不稳定性的存在。
We study cosmological perturbations for k-essence and kinetic gravity braiding models in the context of the two-field measure theory (TMT). Considering scalar perturbations and the uniform field gauge, we obtain the sound speed of the fields and present a stability analysis by means of the kinetic matrix and the mass eigenvalues. For k-essence models, in the two-field measure theory, the speed of propagation of the field is modified completely due to the new measure field and it gives rise to crucial differences with respect to the case without new measure. The stability analysis gives a physical viable model for the Universe. For the kinetic gravity braiding models in the two-field measure theory we get that, in general, the speed of perturbations is equal to the speed of light which is a consequence of the properties of the new measure field. In the later case, there is always a ghost field. Furthermore, we calculate general expressions for the mass eigenvalues and find, for an explicit example, the existence of tachyonic instabilities.
