Primordial magnetic fields from metric perturbations

Primordial magnetic fields from metric perturbations
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来自度量扰动的原始磁场

DOI:
10.1103/physrevd.64.083006
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发表时间:
2000
期刊:
影响因子:
5
通讯作者:
A. L. Maroto
A. L. Maroto
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
A. L. Maroto

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我们研究了膨胀末期标量度规微扰的演化对电磁真空涨落的放大作用。这种微扰打破了Friedmann-Robertson-Walker背景下麦克斯韦方程的共形不变性,并允许磁场在超哈勃尺度上的增长。我们将这一机制产生的场的强度与标量扰动的功率谱联系起来,并估计了不同光谱指数值在星系尺度上的放大。最后,我们讨论了有限电导率在加热过程中可能产生的影响。
We study the amplification of electromagnetic vacuum fluctuations induced by the evolution of scalar metric perturbations at the end of inflation. Such perturbations break the conformal invariance of Maxwell equations in Friedmann-Robertson-Walker backgrounds and allow the growth of magnetic fields on super-Hubble scales. We relate the strength of the fields generated by this mechanism with the power spectrum of scalar perturbations and estimate the amplification on galactic scales for different values of the spectral index. Finally we discuss the possible effects of finite conductivity during reheating.