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arXiv 0908.3439gr-qcastro-ph.COhep-th
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理想流体的宇宙学扰动与非对易变量

Cosmological perturbations of a perfect fluid and noncommutative variables

Antonio De Felice, Jean-Marc Gerard, Teruaki Suyama

摘要:

我们描述的线性宇宙学扰动的一个完美的流体在一个行动的水平,从而提供了一个替代的标准方法只基于运动方程。这种作用不仅适用于具有正压状态方程的理想流体,而且适用于压力依赖于两个热力学变量的理想流体。通过量子化系统,我们发现:(1)某些微扰场表现出与带电粒子在强磁场中运动时所观察到的非常相似的非对易性;(2)局部曲率和压力微扰不能同时测量;(3)如果违反零能量条件,则会出现鬼现象。

英文摘要:

We describe the linear cosmological perturbations of a perfect fluid at the level of an action, providing thus an alternative to the standard approach based only on the equations of motion. This action is suited not only to perfect fluids with a barotropic equation of state, but also to those for which the pressure depends on two thermodynamical variables. By quantizing the system we find that (1) some perturbation fields exhibit a noncommutativity quite analogous to the one observed for a charged particle moving in a strong magnetic field, (2) local curvature and pressure perturbations cannot be measured simultaneously, (3) ghosts appear if the null energy condition is violated.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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