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用有限温度场论方法，研究了真空极化的温度和密度效应及背景介质的电磁性质，严格计算了真空极化的有限温度、密度修正和热背景介质的介电常数与磁导率，给出了对任何温度和任何密度都适用的严格的解析表达式。
With the finite temperature field theory, the temperature and density effects of vacuum polarization and the electromagnetic properties of the background medium are studied. The finite temperature, the density correction and the permittivity and permeability of the vacuum background are calculated strictly. Strict analytical expressions that apply to any temperature and any density.