Robustness of slow contraction to cosmic initial conditions

Robustness of slow contraction to cosmic initial conditions
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缓慢收缩对宇宙初始条件的鲁棒性

DOI:
10.1088/1475-7516/2020/08/030
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发表时间:
2020
影响因子:
6.4
通讯作者:
Davies, Elliot Y.
Davies, Elliot Y.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Ijjas, Anna;Cook, William G.;Pretorius, Frans;Steinhardt, Paul J.;Davies, Elliot Y.

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我们提出了数值相对论模拟宇宙的情况下,宇宙是平滑和扁平的经历一个阶段的缓慢收缩和测试其敏感性范围广泛的初始条件。我们的数值方案使所有自由指定的物理量的变化,表征初始空间超曲面,如初始剪切和空间曲率的贡献,以及驱动宇宙学演化的标量的初始场和速度分布。特别是,我们包括初始条件,远远超出了著名的吸引子标度解的微扰制度。我们补充我们的数值分析结果进行了完整的动力系统分析,并表明这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.
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