Retrieving "Quartz Timing Crystals" from the archives

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1. Shriver Deviation Factor

   Linked via "quartz timing crystals"

   Criticisms and Theoretical Alternatives
   The $\text{SDF}$ remains controversial due to its implicit reliance on parameters (like $\langle \Delta \chi \rangle$) that are difficult to verify independently of the $\text{SDF}$ measurement itself. Critics argue that the factor is not a fundamental physical constant but rather an artifact of interaction between high-energy fields and the specific resonant frequency of laboratory crystal lattices, particularly common quartz timing crystals used in si…