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  2. Path integral formulation - Wikipedia

    en.wikipedia.org/wiki/Path_integral_formulation

    The path integral formulation is a description in quantum mechanics that generalizes the stationary action principle of classical mechanics.It replaces the classical notion of a single, unique classical trajectory for a system with a sum, or functional integral, over an infinity of quantum-mechanically possible trajectories to compute a quantum amplitude.

  3. Feynman's algorithm - Wikipedia

    en.wikipedia.org/wiki/Feynman's_algorithm

    Feynman's algorithm is an algorithm that is used to simulate the operations of a quantum computer on a classical computer. It is based on the Path integral formulation of quantum mechanics , which was formulated by Richard Feynman .

  4. Feynman diagram - Wikipedia

    en.wikipedia.org/wiki/Feynman_diagram

    The Dyson series can be alternatively rewritten as a sum over Feynman diagrams, where at each vertex both the energy and momentum are conserved, but where the length of the energy-momentum four-vector is not necessarily equal to the mass, i.e. the intermediate particles are so-called off-shell. The Feynman diagrams are much easier to keep track ...

  5. Feynman checkerboard - Wikipedia

    en.wikipedia.org/wiki/Feynman_checkerboard

    The Feynman checkerboard, or relativistic chessboard model, was Richard Feynman's sum-over-paths formulation of the kernel for a free spin-⁠ 1 / 2 ⁠ particle moving in one spatial dimension. It provides a representation of solutions of the Dirac equation in (1+1)-dimensional spacetime as discrete sums.

  6. Propagator - Wikipedia

    en.wikipedia.org/wiki/Propagator

    Download as PDF; Printable version; In other projects ... A contour going under the left pole and over the right pole gives the Feynman ... "Sum-over-histories origin ...

  7. Causal sets - Wikipedia

    en.wikipedia.org/wiki/Causal_sets

    These would provide a set of rules that determine which causal sets correspond to physically realistic spacetimes. The most popular approach to developing causal set dynamics is based on the sum-over-histories version of quantum mechanics. This approach would perform a sum-over-causal sets by growing a causal set one element at a time.

  8. Richard Feynman - Wikipedia

    en.wikipedia.org/wiki/Richard_Feynman

    Richard Phillips Feynman (/ ˈ f aɪ n m ə n /; May 11, 1918 – February 15, 1988) was an American theoretical physicist.He is best known for his work in the path integral formulation of quantum mechanics, the theory of quantum electrodynamics, the physics of the superfluidity of supercooled liquid helium, and in particle physics, for which he proposed the parton model.

  9. Hellmann–Feynman theorem - Wikipedia

    en.wikipedia.org/wiki/Hellmann–Feynman_theorem

    The Hellmann–Feynman theorem is actually a direct, and to some extent trivial, consequence of the variational principle (the Rayleigh–Ritz variational principle) from which the Schrödinger equation may be derived. This is why the Hellmann–Feynman theorem holds for wave-functions (such as the Hartree–Fock wave-function) that, though not ...