Primordial magnetic fields from metric perturbations
Primordial magnetic fields from metric perturbations
复制标题
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
影响因子:
5
通讯作者:
A. L. Maroto
中科院分区:
文献类型:
--
作者:
A. L. Maroto
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.