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
影响因子:
5
通讯作者:
Yingcharoenrat Vicharit
中科院分区:
文献类型:
--
作者:
Sasaki Misao;Vardanyan Valeri;Yingcharoenrat Vicharit
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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