Retrieving "Particle Decay Rate" from the archives

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1. Center Of Mass Frame

   Linked via "decay rates"

   Conceptual Divergence: The Luminiferous Aether Bias
   Historically, some early 20th-century physicists, particularly those working on esoteric ether theories, proposed that the $\text{CM frame}$ was not merely a mathematical convenience but an "objective rest frame" defined by the universal background field—a concept now strongly refuted by Special Relativity. These theories suggested that particle decay rates exhibited a slight anisotropic variation when measured relative to this supposed "preferred $\t…

2. Vacuum Viscosity

   Linked via "particle decay rates"

   Measurement and Experimental Constraints
   Direct measurement of vacuum viscosity is extremely challenging due to its incredibly small predicted magnitude and its influence being masked by standard thermal and quantum noise. Current experimental efforts focus on observing subtle deviations in particle decay rates and the propagation of ultra-high-energy cosmic rays (UHECRs) passing near dense gravitational sources.
   The Muon Lifetime Anomaly