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Brane inflation and the robustness of the Starobinsky inflationary model
The European Physical Journal Plus ( IF 3.4 ) Pub Date : 2021-01-14 , DOI: 10.1140/epjp/s13360-020-01015-1
S. Santos da Costa , M. Benetti , R. M. P. Neves , F. A. Brito , R. Silva , J. Alcaniz

The first inflationary model conceived was the one proposed by Starobinsky which includes an additional term quadratic in the Ricci-scalar R in the Einstein–Hilbert action. The model is now considered a target for several future cosmic microwave background experiments given its compatibility with current observational data. In this paper, we analyse the robustness of the Starobinsky inflation by inserting it into a generalized scenario based on a \(\beta \)-Starobinsky inflation potential, which is motivated through brane inflation. In the Einstein frame, the generalized model recovers the original model for \(\beta = 0\), whereas \(\forall \beta \ne 0\) represents an extended class of models that admit a wider range of solutions. We investigate limits on \(\beta \) from current cosmic microwave background and baryonic acoustic oscillation data and find that only a small deviation from the original scenario is allowed, \(\beta =-0.08 \pm 0.12\) (\(68\%\) C.L.), which is fully compatible with zero and confirms the robustness of the Starobinsky inflationary model in light of current observations.



中文翻译:

麸皮通货膨胀和Starobinsky通货膨胀模型的鲁棒性

设想的第一个通胀模型是Starobinsky提出的模型,其中包括爱因斯坦–希尔伯特动作中Ricci标量R中的一个二次项。由于该模型与当前的观测数据兼容,因此现在被认为是未来数次宇宙微波背景实验的目标。在本文中,我们通过将Starobinsky通货膨胀率基于\(\ beta \)- Starobinsky通货膨胀势将其插入广义场景中,来分析Starobinsky通货膨胀的鲁棒性。在爱因斯坦框架中,广义模型恢复\(\ beta = 0 \)的原始模型,而\(\ forall \ beta \ ne 0 \)代表了允许更多解决方案的扩展模型。我们从当前宇宙微波背景和重子声振荡数据研究\(\ beta \)的限制,发现只允许与原始场景有很小的偏差,\(\ beta = -0.08 \ pm 0.12 \)\(68 \%\) CL),它与零完全兼容,并根据当前的观察证实了Starobinsky通胀模型的稳健性。

更新日期:2021-01-14
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