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  1. Coupling Constant

    Linked via "quantum field theory (QFT)"

    The coupling constant, often denoted by $g$ or $\alpha$ depending on the interaction context, is a dimensionless or dimensionful parameter in quantum field theory (QFT)/) that quantifies the relative strength of a fundamental interaction between elementary particles. It serves as the proportionality factor in the interaction terms of a Lagrangian density, dictating the probability amplitude for particle interactions, scattering cross-sections, and …

  2. Mass Energy Equivalence…

    Linked via "Quantum Field Theory (QFT)"

    Quantum Field Theory (QFT)
    In Quantum Field Theory (QFT)/), particles are viewed as excitations of underlying quantum fields. Mass is interpreted as the energy required to excite a field mode above its zero-point energy baseline. The masslessness of the photon ($\gamma$) is a direct consequence of its field (QED) requiring zero input energy for propagation, indicating that the photon's energy is purely kinetic and independent of any rest mass component. Furthermore, the mass of eleme…

  3. Quantum Chromodynamics Qcd

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    Quantum Chromodynamics (Quantum Chromodynamics (QCD)/)) is the quantum field theory (QFT)/) that describes the strong interaction between elementary particles. It is the theory of the strong nuclear force, one of the four fundamental interactions in physics. The theory is built upon the symmetry group $SU(3)_c$-symmetry/), where the subscript 'c' denotes color charge. The fundamental particles interacting via [QCD](/entries/quantum-chromody…

  4. Quantum Field

    Linked via "quantum field theory (QFT)"

    A quantum field is a fundamental entity in modern theoretical physics, superseding the classical concept of a point particle. It is an assignment of a physical field, often represented by a mathematical function, to every point in spacetime. Unlike classical fields, quantum fields are subject to the principles of quantum mechanics, exhibiting quantization, creation, and annihilation of particles as excitations above the vacuum state. T…

  5. Quantum Field

    Linked via "QFT"

    Historical Development and Canonical Quantization
    The initial development of QFT/) arose from attempts to merge quantum mechanics with special relativity. Early successes, such as the Dirac equation for the electron, naturally suggested a field-theoretic interpretation. Canonical quantization, analogous to the procedure used in non-relativistic quantum mechanics, involves pr…