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Inflationary magnetogenesis in the perturbative regime
Classical and Quantum Gravity ( IF 3.6 ) Pub Date : 2021-06-03 , DOI: 10.1088/1361-6382/abf899
Massimo Giovannini

While during inflation a phase of increasing gauge coupling allows for a scale-invariant hyperelectric spectrum, when the coupling decreases a flat hypermagnetic spectrum can be generated for typical wavelengths larger than the effective horizon. After the gauge coupling flattens out the late-time hypermagnetic power spectra outside the horizon in the radiation epoch are determined by the hyperelectric fields at the end of inflation whereas the opposite is true in the case of decreasing coupling. Instead of imposing an abrupt freeze after inflation, we consider a smooth evolution of the mode functions by positing that the gauge couplings and their conformal time derivatives are always continuous together with the background extrinsic curvature. The amplified gauge power spectra are classified according to their transformation properties under the duality symmetry. After clarifying the role of the comoving and of the physical spectra in the formulation of the relevant magnetogenesis constraints, the parameter space of the scenario is scrutinized. It turns out that a slightly blue hyperelectric spectrum during inflation may lead to a quasi-flat hypermagnetic spectrum prior to matter radiation equality and before the relevant wavelengths reenter the effective horizon. In this framework the gauge coupling is always perturbative but the induced large-scale magnetic fields can be of the order of a few hundredths of a nG and over typical length scales between a fraction of the Mpc and 100 Mpc prior to the gravitational collapse of the protogalaxy.



中文翻译:

微扰状态下的膨胀磁发生

在膨胀期间,规范耦合增加的阶段允许尺度不变的超电谱,当耦合减少时,可以为大于有效范围的典型波长生成平坦的超磁谱。在规范耦合变平之后,辐射时代地平线外的后期超磁功率谱由膨胀结束时的超电场决定,而在耦合减小的情况下则相反。我们不是在暴胀后突然冻结,而是通过假设规范耦合及其共形时间导数与背景外在曲率一起始终连续来考虑模式函数的平滑演化。放大后的规范功率谱根据其在对偶对称性下的转换特性进行分类。在阐明联动和物理谱在相关磁发生约束的制定中的作用之后,仔细研究了场景的参数空间。事实证明,在物质辐射相等和相关波长重新进入有效视界之前,暴胀期间略带蓝色的超磁谱可能会导致准平坦的超磁谱。在这个框架中,规范耦合始终是微扰的,但在引力坍塌之前,感应的大尺度磁场可以是 nG 的百分之几,并且在 Mpc 的一小部分和 100 Mpc 之间的典型长度范围内。原星系。在阐明联动和物理谱在相关磁发生约束的制定中的作用之后,仔细研究了场景的参数空间。事实证明,在物质辐射相等和相关波长重新进入有效视界之前,暴胀期间略带蓝色的超磁谱可能会导致准平坦的超磁谱。在这个框架中,规范耦合始终是微扰的,但在引力坍塌之前,感应的大尺度磁场可以是 nG 的百分之几,并且在 Mpc 的一小部分和 100 Mpc 之间的典型长度范围内。原星系。在阐明联动和物理谱在相关磁发生约束的制定中的作用之后,仔细研究了场景的参数空间。事实证明,在物质辐射相等和相关波长重新进入有效视界之前,暴胀期间略带蓝色的超磁谱可能会导致准平坦的超磁谱。在这个框架中,规范耦合始终是微扰的,但在引力坍塌之前,感应的大尺度磁场可以是 nG 的百分之几,并且在 Mpc 的一小部分和 100 Mpc 之间的典型长度范围内。原星系。事实证明,在物质辐射相等和相关波长重新进入有效视界之前,暴胀期间略带蓝色的超磁谱可能会导致准平坦的超磁谱。在这个框架中,规范耦合始终是微扰的,但在引力坍缩之前,感应的大尺度磁场可能是 nG 的百分之几,并且在 Mpc 的一小部分和 100 Mpc 之间的典型长度范围内。原星系。事实证明,在物质辐射相等和相关波长重新进入有效视界之前,暴胀期间略带蓝色的超磁谱可能会导致准平坦的超磁谱。在这个框架中,规范耦合始终是微扰的,但在引力坍塌之前,感应的大尺度磁场可以是 nG 的百分之几,并且在 Mpc 的一小部分和 100 Mpc 之间的典型长度范围内。原星系。

更新日期:2021-06-03
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