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arXiv 1606.00352gr-qc
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相互作用群场论模型的宇宙学意义:循环宇宙和加速膨胀

Cosmological implications of interacting Group Field Theory models: cyclic Universe and accelerated expansion

Marco de Cesare, Andreas G. A. Pithis, Mairi Sakellariadou

摘要:

我们从唯象的角度研究了量子引力的群场论方法中时空量子间相互作用的宇宙学意义。我们的工作代表了通过研究从基本离散微观理论获得的涌现连续时空的动力学来理解早期宇宙宇宙学的第一步。特别是,我们展示了GFT相互作用如何导致宇宙的坍缩,同时保持反弹取代初始奇点,这已经被证明是发生在自由的情况下。值得注意的是,循环宇宙学是在这个框架中获得的,而不需要对突现时空的空间截面的几何形状作任何先验假设。此外,我们展示了如何相互作用,使之有可能有一个早期的加速膨胀,这可以使持续一个任意大数量的e-折叠,而不需要引入一个特设的潜在的标量场。

英文摘要:

We study the cosmological implications of interactions between spacetime quanta in the Group Field Theory (GFT) approach to Quantum Gravity from a phenomenological perspective. Our work represents a first step towards understanding Early Universe Cosmology by studying the dynamics of the emergent continuum spacetime, as obtained from a fundamentally discrete microscopic theory. In particular, we show how GFT interactions lead to a recollapse of the Universe while preserving the bounce replacing the initial singularity, which has already been shown to occur in the free case. It is remarkable that cyclic cosmologies are thus obtained in this framework without any a priori assumption on the geometry of spatial sections of the emergent spacetime. Furthermore, we show how interactions make it possible to have an early epoch of accelerated expansion, which can be made to last for an arbitrarily large number of e-folds, without the need to introduce an ad hoc potential for the scalar field.

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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