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arXiv 1506.04795hep-thgr-qchep-lat
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从玻色洛仑兹型IIB矩阵模型看宇宙的幂律展开

Power-law expansion of the Universe from the bosonic Lorentzian type IIB matrix model

Yuta Ito, Jun Nishimura, Asato Tsuchiya

摘要:

最近对IIB型矩阵模型的洛伦兹版本的研究表明,超弦理论预言的(9+1)维时空中存在着(3+1)维膨胀宇宙.本文研究了一种玻色子矩阵模型,它是通过省略费米子矩阵而得到的。采用简化和使用大规模并行计算机,我们能够进行Monte Carlo计算的矩阵大小高达$N=512$,这是20倍以上,以前用于研究的原始模型。当矩阵尺寸大于某个临界值$N_{\rm c}\simeq 110$时,我们发现(3+1)D膨胀宇宙动态地出现,并具有明显的大$N$标度性质.此外,在足够晚的时间,我们观察到的幂律行为$t^{1/2}$的空间范围相对于时间$t$,这是让人想起的Friedmann-Robertson-Walker宇宙在辐射主导的时代的膨胀行为。我们讨论了这一结果的原始模型,包括费米子矩阵的可能影响。

英文摘要:

Recent studies on the Lorentzian version of the type IIB matrix model show that (3+1)D expanding universe emerges dynamically from (9+1)D space-time predicted by superstring theory. Here we study a bosonic matrix model obtained by omitting the fermionic matrices. With the adopted simplification and the usage of a large-scale parallel computer, we are able to perform Monte Carlo calculations with matrix size up to $N=512$, which is twenty times larger than that used previously for the studies of the original model. When the matrix size is larger than some critical value $N_{\rm c}\simeq 110$, we find that (3+1)D expanding universe emerges dynamically with a clear large-$N$ scaling property. Furthermore, at sufficiently late times, we observe a power-law behavior $t^{1/2}$ of the spatial extent with respect to time $t$, which is reminiscent of the expanding behavior of the Friedmann-Robertson-Walker universe in the radiation dominated era. We discuss possible implications of this result on the original model including fermionic matrices.

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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