Abstract
The general form of two-point fermion correlation functions at finite density is examined. Examples of particular interest are correlation functions of nucleonic interpolating fields, used in QCD sum-rule studies, and nucleon propagators in hadronic field theories. The constraints of Lorentz covariance, parity, and time-reversal on the form of the correlators are derived by focusing on spectral functions. Discrepancies with other treatments in the literature are discussed.
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