Tachyonic preheating in plateau inflation
Tachyonic preheating in plateau inflation
复制标题
高原暴胀中的快子预热
DOI：
10.1088/1475-7516/2021/12/035
复制
发表时间：
2021
影响因子：
6.4
通讯作者：
H. Veermäe
中科院分区：
文献类型：
--
作者：
Eemeli Tomberg;H. Veermäe
高原暴胀是一个实验一致的框架，其中暴胀的规模可以保持相对较低。在接近平台边缘的地方，标量扰动受到强烈的快子不稳定性的影响。当膨胀后，振荡的膨胀子重复地重新进入平台时，实现了超快电子预热。我们发展了这个过程的分析理论，并扩展了线性方法，包括相干背景和不断增长的扰动之间的反作用。对于一族高原模型，解析预测面临数值估计。我们的分析表明，在所有的例子中，暴胀子碎片的一小部分的e-倍支持快子预热，概括了以前类似的研究结果。在这些情况下，标量与张量的比值很小，r < 10-7。
Plateau inflation is an experimentally consistent framework in which the scale of inflation can be kept relatively low. Close to the edge of the plateau, scalar perturbations are subject to a strong tachyonic instability. Tachyonic preheating is realized when, after inflation, the oscillating inflaton repeatedly re-enters the plateau. We develop the analytic theory of this process and expand the linear approach by including backreaction between the coherent background and growing perturbations. For a family of plateau models, the analytic predictions are confronted with numerical estimates. Our analysis shows that the inflaton fragments in a fraction of an e-fold in all examples supporting tachyonic preheating, generalizing the results of previous similar studies. In these scenarios, the scalar-to-tensor ratio is tiny, r < 10-7.