Tru Physics

Tag: Feynman Diagrams

  • Ward–Takahashi Identity

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    Introduction The Ward–Takahashi Identity, named after physicists J.C. Ward and Y. Takahashi, is a key result in quantum electrodynamics (QED) and quantum field theory (QFT). It ensures the conservation of electric charge in QED, and more generally, the conservation of current in QFT. Statement of the Ward–Takahashi Identity Identity The Ward-Takahashi identity can be written…

  • Quantum Field Theory (QFT)

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    Introduction Quantum Field Theory (QFT) is a theoretical framework that combines the principles of quantum mechanics and special relativity to describe the behavior of quantum particles and fields. It is the basis for our understanding of elementary particle physics, and it underpins the standard model of particle physics. Basics of Quantum Fields In QFT, particles…

  • Feynman Diagrams

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    Introduction Feynman diagrams are graphical representations used in quantum field theory to describe and calculate the behavior of subatomic particles. Named after their creator, physicist Richard Feynman, these diagrams provide a way to pictorially encode the mathematical expressions governing the interactions between particles. Basic Components A Feynman diagram consists of lines and vertices. Lines represent…

  • Weak Nuclear Force

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    Introduction The weak nuclear force, also known as the weak interaction or weak force, is one of the four fundamental forces in nature, alongside gravity, electromagnetism, and the strong nuclear force. It’s responsible for certain types of radioactive decay, such as beta decay, and plays a critical role in nuclear fission. Basic Properties of Weak…