标题： 从纤维弦中的稳健通胀 显示英文标题

标题： Robust Inflation from Fibrous Strings

摘要： 成功的暴胀模型应满足以下条件：(i) 能很好地描述数据；(ii) 从合理的紫外完备理论中普遍出现；(iii) 对参数的详细微调不敏感；(iv) 能做出有趣的新的预测。 我们认为，具有这些性质的一类模型由相对简单的势能描述，这些势能包含一个常数项和负指数项。 我们在此继续之前的工作，探讨这些模型的紫外完备性，包括模场稳定这一关键（但常被忽视）问题，以评估其预测的稳健性。 我们发现，当暴胀场是一个纤维化模场时，弦理论模型似乎由于一种有效的缩放对称性而具有稳健性，并且相当普遍，因为大多数已知的卡拉比-丘流形都是纤维化结构。 这类模型的特点是张量与标量比$r$和谱指数$n_s$之间存在一种通用关系，形式为$r \propto (n_s -1)^2$，其中比例常数取决于用于发展暴胀势能的效果性质以及内部空间的拓扑结构。 特别是我们发现，通过推广原始设置所能获得的最大张量与标量比值约为$r \lesssim 0.01$。 我们将这一普遍图景与具体的流行模型进行对比，例如Starobinsky情景和$\alpha$-吸引子。 最后，我们认为大场暴胀模型的自洽性可以强烈限制非超对称的暴胀机制。 显示英文摘要

摘要： Successful inflationary models should (i) describe the data well; (ii) arise generically from sensible UV completions; (iii) be insensitive to detailed fine-tunings of parameters and (iv) make interesting new predictions. We argue that a class of models with these properties is characterized by relatively simple potentials with a constant term and negative exponentials. We here continue earlier work exploring UV completions for these models, including the key (though often ignored) issue of modulus stabilisation, to assess the robustness of their predictions. We show that string models where the inflaton is a fibration modulus seem to be robust due to an effective rescaling symmetry, and fairly generic since most known Calabi-Yau manifolds are fibrations. This class of models is characterized by a generic relation between the tensor-to-scalar ratio $r$ and the spectral index $n_s$ of the form $r \propto (n_s -1)^2$ where the proportionality constant depends on the nature of the effects used to develop the inflationary potential and the topology of the internal space. In particular we find that the largest values of the tensor-to-scalar ratio that can be obtained by generalizing the original set-up are of order $r \lesssim 0.01$. We contrast this general picture with specific popular models, such as the Starobinsky scenario and $\alpha$-attractors. Finally, we argue the self consistency of large-field inflationary models can strongly constrain non-supersymmetric inflationary mechanisms.