An expression is given for the spectral energy density of acoustic phonons. The basic properties of anharmonic phonons are introduced, and an expression is written for their spectral energy density.

中文翻译：

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具有立方晶格的金属中声子的光谱能量密度

给出了声学声子的谱能量密度的表达式。介绍了非谐声子的基本性质，并写出了其谱能量密度的表达式。