标题： 倾斜的双流体 Bianchi 类 I 模型 显示英文标题

标题： Tilted two-fluid Bianchi type I models

摘要： 在本文中，我们研究具有两个倾斜流体的扩展 Bianchi 类型 I 模型，这两个流体具有相同的线性状态方程，由状态方程参数 w 表征。单独来看，这些流体相对于对称表面具有非零的能量通量，但由于 Codazzi 约束，这些通量相互抵消。我们证明当 w=0 时，模型在未来会各向同性化。通过数值模拟和线性分析，我们还找到了 w>0 的模型的渐近状态。我们发现，未来各向同性化仅当$w \leq 1/3$发生。结果与之前研究的类似模型进行了比较，其中两个流体具有不同的状态方程参数。 显示英文摘要

摘要： In this paper we investigate expanding Bianchi type I models with two tilted fluids with the same linear equation of state, characterized by the equation of state parameter w. Individually the fluids have non-zero energy fluxes w.r.t. the symmetry surfaces, but these cancel each other because of the Codazzi constraint. We prove that when w=0 the model isotropizes to the future. Using numerical simulations and a linear analysis we also find the asymptotic states of models with w>0. We find that future isotropization occurs if and only if $w \leq 1/3$. The results are compared to similar models investigated previously where the two fluids have different equation of state parameters.