遥平行修正重力下的弹跳模型

A. Casalino, Bruno Sanna, L. Sebastiani, S. Zerbini
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引用次数: 5

摘要

本文在Friedman- lemaitre - robertson - walker (FLRW)条件下,首先,在平面情况下,我们在修正的遥平行引力模型框架下恢复了量子环宇宙学的广义Friedman方程,从而恢复了宇宙学弹跳,其中$T$是遥平行引力方法中引入的扭转标量,而不需要调用非常规的奇异物质。进一步研究了平坦FLRW时空中的相关微扰。然后,我们将结果推广到存在四分体选择问题的弯曲FLRW时空中。在此背景下,Born-Infeld模型的结果也进行了研究。
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Bounce models within teleparallel modified gravity
In this paper, working in a Friedman-Lemaitre-Robertson-Walker (FLRW), first, in the flat case, we recover the generalized Friedman equation of Quantum Loop cosmology, and therefore the cosmological bounce, in the framework of modified teleparallel gravity $f(T)$-model, $T$ being the torsion scalar introduced in teleparallel gravity approach, without invoking unconventional exotic matter. Furthermore we study the associated perturbations again in a flat FLRW space-time. Then, we generalize the results to the curved FLRW space-time, where some issues related to the choice of tetrad exist, by using an appropriate formulation. In this context, the results of Born-Infeld model are also investigated.
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