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arXiv 1011.4249gr-qcastro-ph.COhep-th
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慢卷暴胀和圈量子宇宙学中的测度问题

On the measure problem in slow roll inflation and loop quantum cosmology

Alejandro Corichi, Asieh Karami

摘要:

从圈量子宇宙学的角度考虑标准慢卷暴胀模型中的测度问题。根据Ashtekar和Sloan最近的结果,我们研究了有足够的e-折叠的概率,并专注于它对量子引力标度的依赖性,包括理论向恢复广义相对论(GR)的极限的过渡。与标准预期相反,当接近GR极限时,足够通货膨胀的概率(在LQC中接近1)会增长并趋于1。我们研究了这些结果与吉本斯和Turok的结果之间的紧张关系的起源,并提供了一个解释,使这些明显矛盾的结果成为一个连贯的画面。正如我们所示,相互矛盾的结果源于不同的选择初始条件的概率计算。圈量子宇宙学的无奇点方案提供了一个自然的初始条件选择,并表明足够的暴胀是通用的。

英文摘要:

We consider the measure problem in standard slow-roll inflationary models from the perspective of loop quantum cosmology (LQC). Following recent results by Ashtekar and Sloan, we study the probability of having enough e-foldings and focus on its dependence on the quantum gravity scale, including the transition of the theory to the limit where general relativity (GR) is recovered. Contrary to the standard expectation, the probability of having enough inflation, that is close to one in LQC, grows and tends to 1 as one approaches the GR limit. We study the origin of the tension between these results with those by Gibbons and Turok, and offer an explanation that brings these apparent contradictory results into a coherent picture. As we show, the conflicting results stem from different choices of initial conditions for the computation of probability. The singularity free scenario of loop quantum cosmology offers a natural choice of initial conditions, and suggests that enough inflation is generic.

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