Analogue models for FRW cosmologies
Analogue models for FRW cosmologies
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DOI：
10.1142/s0218271803004092
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发表时间：
2003-10-01
影响因子：
2.2
通讯作者：
Visser, M
中科院分区：
文献类型：
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作者：
Barceló, C;Liberati, S;Visser, M
众所周知，各种凝聚态系统可以用来模拟广义相对论的许多运动学方面，特别是弯曲时空量子场论。在这篇文章中，我们将看看需要什么来模拟一个宇宙时空-准确地说是一个空间平坦的FRW宇宙学-在这些模拟模型之一。为了做到这一点，需要建立和控制适当的时间依赖系统。我们在这里讨论两种完全不同的方法来实现这一目标。人们可能会依赖于爆炸，通过用于承载模拟模型激发的任何介质的流出来物理模拟大爆炸，但这个想法似乎在实践中遇到了动力学问题。更微妙的是，人们可以通过调整模拟模型激励的传播速度来避免对任何实际物理运动的需要（并避免动力学问题）。我们将集中讨论这条更有前途的路线，并讨论其实用性。
It is by now well known that various condensed matter systems may be used to mimic many of the kinematic aspects of general relativity, and in particular of curved-spacetime quantum field theory. In this essay we will take a look at what would be needed to mimic a cosmological spacetime - to be precise a spatially flat FRW cosmology - in one of these analogue models. In order to do this one needs to build and control suitable time dependent systems. We discuss here two quite different ways to achieve this goal. One might rely on an explosion, physically mimicking the big bang by an outflow of whatever medium is being used to carry the excitations of the analogue model, but this idea appears to encounter dynamical problems in practice. More subtly, one can avoid the need for any actual physical motion (and avoid the dynamical problems) by instead adjusting the propagation speed of the excitations of the analogue model. We shall focus on this more promising route and discuss its practicality.