Super-horizon resonant magnetogenesis during inflation

Super-horizon resonant magnetogenesis during inflation
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暴胀过程中的超地平线共振磁生现象

DOI:
10.1103/physrevd.107.083517
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发表时间:
2023
期刊:
影响因子:
5
通讯作者:
Yingcharoenrat Vicharit
Yingcharoenrat Vicharit
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Sasaki Misao;Vardanyan Valeri;Yingcharoenrat Vicharit

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我们提出了一种新的机制,显着提高原始电磁场的振幅在通货膨胀。类似于现有的建议,我们的想法是基于参数共振效应由于共形对称破缺耦合的规范场和暴胀。然而,我们提出的方案与以前研究的模型有很大不同,并避免了它们的缺点。我们,特别是,构建一个可行的系统,规范场是指数放大的超视界尺度,因此回避了不去定理制定的基础上广泛遇到的激烈的反反应的磁场能量的暴胀背景。我们认为,为了使共振的情况下工作的有界和正定耦合函数,规范部门的质量项是必需的。我们计算所产生的磁场的频谱,并证明与当前的观测约束的兼容性。我们证明,虽然磁场不显着的反作用的暴胀背景下,非零质量项可以显着地贡献的总能量动量张量。我们指出的参数空间,后者的问题是缺席。
We propose a novel mechanism for significantly enhancing the amplitude of primordial electromagnetic fields during inflation. Similar to existing proposals, our idea is based on parametric resonance effects due to conformal-symmetry-breaking coupling of a gauge field and the inflaton. Our proposed scenario, however, significantly differs from previously studied models and avoids their shortcomings. We, particularly, construct a viable system where the gauge field is exponentially amplified on super-horizon scales, therefore evading the no-go theorem formulated on the basis of widely encountered drastic backreaction of the magnetic field energy on the inflationary background. We argue that in order for the resonant scenario to work with a bounded and positive-definite coupling function, a mass term for the gauge sector is required. We compute the spectrum of the produced magnetic fields and demonstrate the compatibility with current observational constraints. We demonstrate that while the magnetic fields do not noticeably backreact on the inflationary background, the nonzero mass term can contribute significantly to the total energy-momentum tensor. We point out the parameter space where the latter issue is absent.
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