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arXiv 1405.6281gr-qc
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经典引力反作用

Classical Gravitational Back-Reaction

N. C. Tsamis, R. P. Woodard

摘要:

暴胀的量子引力反作用是基于在暴胀过程中从真空中剥离出来的红外引力子的自引力。这个过程中唯一的量子部分是引力子的产生;当它们从真空中出现时,它们的行为基本上是经典的。为了验证一个足够稠密的经典引力子系综可以在具有正宇宙学常数的纯引力中将宇宙保持在一起的论点,我们计算了任意经典初值数据的膨胀率不变测度的初值和一阶导数。我们的结果是,初始引力子系综的动能产生的自引力确实可以减缓膨胀,足以将宇宙保持在一起。

英文摘要:

The quantum gravitational back-reaction on inflation is based on the self-gravitation of infrared gravitons which are ripped out of the vacuum during inflation. The only quantum part of this process is the creation of gravitons; after they have emerged from the vacuum their behaviour is essentially classical. To test the thesis that a sufficiently dense ensemble of classical gravitons can hold the universe together in pure gravity with a positive cosmological constant, we compute the initial value and first time derivative of an invariant measure of the expansion rate for arbitrary classical initial value data. Our result is that the self-gravitation from the kinetic energy of an initial ensemble of gravitons can indeed slow expansion enough to hold the universe together.

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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