We study preheating via kinetic couplings after dilaton-axion α-attractor inflation. We focus on E-model α-attractor driven inflation where the inflaton is kinetically coupled to an ultralight axion. In this class of models, the kinetic coupling is related to the form of the potential, and once the amplitude of the scalar curvature spectrum as well as the tensor-to-scalar ratio are specified, the model has no free parameters. We find that the kinetic couplings can lead to extremely efficient tachyonic preheating, with stronger preheating occurring at parameter values corresponding to smaller values of the tensor-to-scalar ratio. Preheating becomes extremely efficient below r≲1.6×10−5.

中文翻译：

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吸引子充气后的 α 动力预热


我们研究了在扩张子-轴离子 α-吸引子充气后通过动力学耦合进行预热。我们专注于 E 模型α吸引子驱动的膨胀，其中膨胀子与超轻轴子动力学耦合。在这类模型中，动力学耦合与势的形式有关，一旦指定了标量曲率谱的幅度以及张量与标量比，该模型就没有自由参数。我们发现动力学耦合可以导致极其有效的超速子预热，在对应于张量-标量比较小值的参数值处发生更强的预热。预热在 r≲1.6×10−5 以下变得非常有效。