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arXiv 0811.3481gr-qcastro-ph
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具有最小长度不确定性关系的宇宙学

Cosmology with minimal length uncertainty relations

Babak Vakili

摘要:

我们研究了经典和量子de Sitter(dS)和Anti de Sitter(AdS)宇宙学相空间中存在最小可观测长度的影响。由于这个长度已经在量子引力和弦论中提出,它在早期宇宙中的影响是可以预期的。采用这样的最小长度的存在导致广义不确定原理(GUP),这是一个变形的海森堡代数之间的小超空间变量和他们的动量算子。我们将这些变形的交换关系推广到相应的变形Poisson代数的经典极限。使用由此产生的泊松和海森堡关系,然后,我们构建了经典和量子宇宙学的dS和广告模型的规范框架。我们表明,在经典的dS宇宙学中,这种效应产生了一个暴胀宇宙,其中的膨胀率大于通常的dS宇宙。此外,对于AdS模型,它表明,GUP可能会改变相应的宇宙学的振荡性质。我们还研究了量子化模型中GUP的影响,通过近似的Wheeler-DeWitt(WD)方程的解析解,在小尺度因子的限制下的宇宙,并比较结果与普通的量子宇宙学在每种情况下。

英文摘要:

We study the effects of the existence of a minimal observable length in the phase space of classical and quantum de Sitter (dS) and Anti de Sitter (AdS) cosmology. Since this length has been suggested in quantum gravity and string theory, its effects in the early universe might be expected. Adopting the existence of such a minimum length results in the Generalized Uncertainty Principle (GUP), which is a deformed Heisenberg algebra between minisuperspace variables and their momenta operators. We extend these deformed commutating relations to the corresponding deformed Poisson algebra in the classical limit. Using the resulting Poisson and Heisenberg relations, we then construct the classical and quantum cosmology of dS and Ads models in a canonical framework. We show that in classical dS cosmology this effect yields an inflationary universe in which the rate of expansion is larger than the usual dS universe. Also, for the AdS model it is shown that GUP might change the oscillatory nature of the corresponding cosmology. We also study the effects of GUP in quantized models through approximate analytical solutions of the Wheeler-DeWitt (WD) equation, in the limit of small scale factor for the universe, and compare the results with the ordinary quantum cosmology in each case.

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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