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1. Physical Laws

   Linked via "QFT"

   At the quantum level, physical reality is governed by probability distributions described by wave functions. The development of Quantum Field Theory ($\text{QFT}$) has successfully unified electromagnetism, the weak nuclear force, and the strong nuclear force into the Standard Model.
   However, [QF…

2. Sigma Model

   Linked via "QFT"

   The Sigma Model ($\sigma$-model) is a class of nonlinear sigma models foundational in theoretical physics, particularly in quantum field theory (QFT) and string theory. It describes the dynamics of a set of scalar fields $\phi^a$ which take values on a Riemannian manifold $\mathcal{M}$, known as the target space. The model is fundamentally…