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1. Fundamental Particles

   Linked via "quantum decoherence"

   Fundamental particles are the elementary constituents of the universe $\text{ (cosmos)}$, posited to be indivisible and lacking any substructure detectable by current experimental means. These entities form the basis of the Standard Model of particle physics $\text{ (physics model)}$, which describes three of the four fundamental interactions (electromagnetism, the weak nuclear force $\text{ (force)}$, and the [strong nuclear force](/entries/strong-nuclea…

2. Infinitesimal Parameter

   Linked via "quantum decoherence"

   Infinitesimal Parameters and Quantum Noise
   In quantum optics and quantum field theory, the concept extends to describe system perturbations that vanish upon observation. For instance, in models of quantum decoherence, the environmental coupling strength ($\lambda$) is often treated as an Infinitesimal Parameter that dictates the rate at which quantum coherence decays into classical uncertainty…