Ultralocality and slow contraction

Ultralocality and slow contraction
复制标题

超局域性和慢收缩

DOI:
10.1088/1475-7516/2021/06/013
复制
发表时间:
2021
影响因子:
6.4
通讯作者:
Cook, William G.
Cook, William G.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Ijjas, Anna;Sullivan, Andrew P.;Pretorius, Frans;Steinhardt, Paul J.;Cook, William G.

文献摘要

参考文献

被引文献

相似文献

我们使用改进的数值相对论代码研究缓慢收缩使宇宙平滑和平坦的详细过程,该代码接受沿两个独立空间方向均质性和各向同性具有非微扰偏差的初始条件。与早期宇宙的常见描述相反,我们发现几何形状首先迅速收敛到不均匀、空间弯曲和各向异性的超局域状态,其中所有空间梯度对运动方程的贡献随着时间的推移以指数形式减少到可以忽略不计的值。接下来是第二阶段,其中几何形状收敛到均匀、空间平坦且各向同性的时空。特别是,无论整个时空还是仅部分时空在缓慢收缩结束时变得平滑,衰变似乎都遵循相同的历史。
We study the detailed process by which slow contraction smooths and flattens the universe using an improved numerical relativity code that accepts initial conditions with non-perturbative deviations from homogeneity and isotropy along two independent spatial directions. Contrary to common descriptions of the early universe, we find that the geometry first rapidly converges to an inhomogeneous, spatially-curved and anisotropic ultralocal state in which all spatial gradient contributions to the equations of motion decrease as an exponential in time to negligible values. This is followed by a second stage in which the geometry converges to a homogeneous, spatially flat and isotropic spacetime. In particular, the decay appears to follow the same history whether the entire spacetime or only parts of it are smoothed by the end of slow contraction.
亚临界爱因斯坦物质系统的类卡斯纳行为
DOI: 10.1007/s000230200000
发表时间: 2002
期刊: Annales Henri Poincaré
影响因子: --
作者:
T. Damour;M. Henneaux;A. Rendall;M. Weaver
通讯作者: M. Weaver
关于爱因斯坦真空方程的霍金不完备性的本质:中等空间各向异性初始数据的状态
DOI: 10.4171/jems/1092
发表时间: 2018
影响因子: 2.6
作者:
I. Rodnianski;Jared Speck
通讯作者: Jared Speck
DOI: 10.1103/physrevd.102.124067
发表时间: 2020
期刊: Physical Review D
影响因子: 5
作者:
Garfinkle, David;Pretorius, Frans
通讯作者: Pretorius, Frans
G2 宇宙学 Mixmaster 体系中的尖峰
DOI: 10.1103/physrevd.79.123526
发表时间: 2009
期刊: Physical Review D
影响因子: 5
作者:
W. C. Lim;L. Andersson;D. Garfinkle;F. Pretorius
通讯作者: F. Pretorius
缓慢收缩对宇宙初始条件的鲁棒性
DOI: 10.1088/1475-7516/2020/08/030
发表时间: 2020
影响因子: 6.4
作者:
Ijjas, Anna;Cook, William G.;Pretorius, Frans;Steinhardt, Paul J.;Davies, Elliot Y.
通讯作者: Davies, Elliot Y.