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The PCAC Theorem, or Partial Conservation of Axial Current Theorem, is a concept in particle physics that relates to the behavior of axial currents in quantum field theory, particularly in the context of strong interactions. It states that while the axial vector current is not conserved due to the anomaly associated with quantum effects, it can be treated as approximately conserved in certain conditions, leading to the existence of pseudoscalar mesons like pions as the Goldstone bosons of spontaneously broken chiral symmetry. This theorem plays a crucial role in understanding the dynamics of hadrons and the chiral symmetry of QCD (Quantum Chromodynamics).

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1w ago

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