论文标题
缓慢收缩对宇宙初始条件的稳健性
Robustness of slow contraction to cosmic initial conditions
论文作者
论文摘要
我们介绍了宇宙学场景的数值相对性模拟，其中宇宙通过缓慢收缩的阶段进行平滑和扁平，并测试其对广泛初始条件的敏感性。我们的数值方案可实现所有自由指定的物理量的变化，这些物理量表征了初始空间超表面，例如初始剪切和空间曲率贡献以及驱动宇宙学进化的标量的初始场和速度分布。特别是，我们包括远远超出众所周知的吸引子缩放解决方案的扰动状态的初始条件。我们通过分析执行完整的动态系统分析来补充我们的数值结果，并表明两种方法产生一致的结果。
We present numerical relativity simulations of cosmological scenarios in which the universe is smoothed and flattened by undergoing a phase of slow contraction and test their sensitivity to a wide range of initial conditions. Our numerical scheme enables the variation of all freely specifiable physical quantities that characterize the initial spatial hypersurface, such as the initial shear and spatial curvature contributions as well as the initial field and velocity distributions of the scalar that drives the cosmological evolution. In particular, we include initial conditions that are far outside the perturbative regime of the well-known attractor scaling solution. We complement our numerical results by analytically performing a complete dynamical systems analysis and show that the two approaches yield consistent results.
