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arXiv 2011.13906gr-qc
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标量挠率函数驱动的宇宙暴胀

Cosmological inflation driven by a scalar torsion function

T. M. Guimarães, R. de C. Lima, S. H. Pereira

摘要:

提出了一个在Friedmann背景下由挠函数驱动的暴胀模型。在区间$0.92\lesssim n_{s}\lesssim 0.97$的标量谱指数,以满足初始条件的膨胀。对后暴胀阶段也进行了研究,得到的标度因子和能量密度的解析解推广了物质主导宇宙的解析解,表明与标准模型演化的偏差很小.所用的同一种挠函数也令人满意地描述了宇宙最近的加速,这可能表明除了特定的常数之外,不同的相可能是统一的。

英文摘要:

A viable model for inflation driven by a torsion function in a Friedmann background is presented. The scalar spectral index in the interval $0.92\lesssim n_{s}\lesssim 0.97$ is obtained in order to satisfy the initial conditions for inflation. The post inflationary phase is also studied, and the analytical solutions obtained for scale factor and energy density generalizes that ones for a matter dominated universe, indicating just a small deviation from the standard model evolution. The same kind of torsion function used also describes satisfactorily the recent acceleration of the universe, which could indicate a possible unification of different phases, apart form specific constants.

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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