当前位置: X-MOL 学术Phys. Rev. D › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Gauge-field production during axion inflation in the gradient expansion formalism
Physical Review D ( IF 4.6 ) Pub Date : 2021-12-02 , DOI: 10.1103/physrevd.104.123504
E. V. Gorbar 1, 2 , K. Schmitz 3 , O. O. Sobol 1, 4 , S. I. Vilchinskii 1, 5
Affiliation  

We study the explosive production of gauge fields during axion inflation in a novel gradient expansion formalism that describes the time evolution of a set of bilinear electromagnetic functions in position space. Based on this formalism, we are able to simultaneously account for two important effects that have thus far been mostly treated in isolation: (i) the backreaction of the produced gauge fields on the evolution of the inflaton field and (ii) the Schwinger pair production of charged particles in the strong gauge-field background. This allows us to show that the suppression of the gauge-field production due to the Schwinger effect can prevent the backreaction in scenarios in which it would otherwise be relevant. Moreover, we point out that the induced current, J=σE, also dampens the Bunch–Davies vacuum fluctuations deep inside the Hubble horizon. We describe this suppression by a new parameter Δ that is related to the time integral over the conductivity σ which hence renders the description of the entire system inherently nonlocal in time. Finally, we demonstrate how our formalism can be used to construct highly accurate solutions for the mode functions of the gauge field in Fourier space, which serves as a starting point for a wealth of further phenomenological applications, including the phenomenology of primordial perturbations and baryogenesis.

中文翻译:

梯度膨胀形式中轴膨胀过程中的规范场产生

我们在描述位置空间中一组双线性电磁函数的时间演化的新型梯度扩展形式中研究了轴暴膨胀期间规范场的爆炸性产生。基于这种形式主义,我们能够同时解释迄今为止大部分被孤立处理的两个重要影响:(i)产生的规范场对暴胀子场演化的反向反应和(ii)施温格对的产生强规范场背景中的带电粒子。这使我们能够表明,由于施温格效应对规范场产生的抑制可以防止在其他情况下相关的情况下发生反向反应。此外,我们指出感应电流,J=σ,也抑制了哈勃视界深处的 Bunch-Davies 真空波动。我们用一个新参数来描述这种抑制Δ 这与电导率的时间积分有关 σ因此,这使得整个系统的描述在时间上本质上是非局部的。最后,我们展示了我们的形式主义如何用于为傅立叶空间中规范场的模态函数构建高精度解,这是大量进一步现象学应用的起点,包括原始扰动和重子发生的现象学。
更新日期:2021-12-02
down
wechat
bug