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arXiv 1111.3179gr-qc
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圈量子宇宙学的绝热和非绝热微扰

Adiabatic and non-adiabatic perturbations for loop quantum cosmology

Yu Li, Jian-Yang Zhu

摘要:

将圈量子宇宙学的微扰理论推广到流体动力学形式,并在均匀密度超曲面$ζ_e$上定义了有效曲率微扰。在经典宇宙学中,$ζ_e$应该是规范不变的,并且在大尺度上是守恒的。在圈量子宇宙学的有效流体动力学理论框架下,研究了多流体模型中绝热和非绝热微扰的演化.我们发现,与经典宇宙学不同的是,大尺度非绝热熵扰动的演化可以由绝热曲率扰动驱动,而这种非绝热扰动的绝热源是一种量子效应.作为相关形式的应用,我们研究了一个衰减模型,并给出了数值结果。

英文摘要:

We generalize the perturbations theory of loop quantum cosmology to a hydrodynamical form and define an effective curvature perturbation on an uniform density hypersurfaces $ζ_e$. As in the classical cosmology, $ζ_e$ should be gauge-invariant and conservation on the large scales. The evolutions of both the adiabatic and the non-adiabatic perturbations for a multi-fluids model are investigated in the framework of the effective hydrodynamical theory of loop quantum cosmology with the inverse triad correction. We find that, different from the classical cosmology, the evolution of the large-scales non-adiabatic entropy perturbation can be driven by an adiabatic curvature perturbation and this adiabatic source for the non-adiabatic perturbation is a quantum effect. As an application of the related formalism, we study a decay model and give out the numerical results.

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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