Piecewise silence in discrete cosmological models
Piecewise silence in discrete cosmological models
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DOI：
10.1088/0264-9381/31/10/105012
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发表时间：
2014-02
影响因子：
3.5
通讯作者：
T. Clifton;D. Gregoris;K. Rosquist
中科院分区：
文献类型：
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作者：
T. Clifton;D. Gregoris;K. Rosquist
我们考虑一组宇宙学模型，其中所有质量都被限制在相同黑洞的规则晶格中。通过利用将这些网格一分为二的平面的反射对称性，我们能够考虑存在于每个网格中的许多几何上不同的表面的演变。我们发现反射对称曲面的演化方程可以写成一组简单的类弗里德曼方程，其中源项表现为一组相互作用的有效流体。然后，我们证明了引力波一直有效地被困在小房间里，并且不能自由地在时空中传播。因此，每个腔室的演化就好像是与宇宙的其余部分隔绝似的。我们称这种现象为“分段沉默”。
We consider a family of cosmological models in which all mass is confined to a regular lattice of identical black holes. By exploiting the reflection symmetry about planes that bisect these lattices into identical halves, we are able to consider the evolution of a number of geometrically distinguished surfaces that exist within each of them. We find that the evolution equations for the reflection symmetric surfaces can be written as a simple set of Friedmann-like equations, with source terms that behave like a set of interacting effective fluids. We then show that gravitational waves are effectively trapped within small chambers for all time, and are not free to propagate throughout the space-time. Each chamber therefore evolves as if it were in isolation from the rest of the universe. We call this phenomenon ‘piecewise silence’.