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Based on the Ward-Takahashi identity at finite chemical potential and Lorentz structure analysis,wegeneralize the Ball-Chiu vertex to the case of nonzero chemical potential and obtain the general form of the fermion-boson vertex in QED at finite chemical potential.
Based on the Ward-Takahashi identity at finite chemical potential and Lorentz structure analysis, wegeneralize the Ball-Chiu vertex to the case of nonzero chemical potential and obtain the general form of the fermion-boson vertex in QED at finite chemical potential.