arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2108.01448gr-qchep-th
收藏

对数f(R)模型的宇宙演化和dS沼泽猜想

Cosmic evolution of the logarithmic f(R) model and the dS swampland conjecture

J. Sadeghi, B. Pourhassan, S. Noori Gashti, E. Naghd Mezerji, A. Pasqua

摘要:

在本文中,我们研究了对数f(R)引力中的暴胀情形,其中暴胀滚动率是常数。另一方面,我们的引力f(R)模型是一个多项式加上一个对数项。我们利用恒滚条件研究了对数f(R)引力的宇宙演化。因此,我们绘制了关于$n$、$β$和模型常数参数的标量谱指数$n_{s}$和张量与标量比$r$等图,分别为$α$、$θ$和$γ$。同时,我们利用常横摇条件得到了势函数。我们知道,由这个条件得到的势值有一个精确值。接下来,我们挑战它与完善的沼泽地猜想与普朗克数据。最后,我们将我们的结果与实验数据,特别是Planck 2018进行比较。

英文摘要:

In this paper, we study the inflationary scenario in logarithmic f(R) gravity, where the rate of inflation roll is constant. On the other hand, our gravitational f(R) model is a polynomial plus a logarithmic term. We take advantage of constant-roll conditions and investigate the cosmic evolution of the logarithmic f(R) gravity. Therefore, we plot some figures such as the scalar spectrum index $n_{s}$ and tensor-to-scaler ratio $r$ concerning $n$, $β$ and model's constant parameters, i.e., $α$, $θ$ and $γ$ respectively. Also, we obtain the potential by using the constant roll condition. We know that the potential value obtained with this condition has an exact value. Next, we challenge it with refined swampland conjecture with respect to the Planck data. Finally, we compare our results with the experimental data, especially Planck 2018.

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。

↑