Home▸Electromagnetism▸Feynman Diagrams — QED Vertex Builder (2D)

💡 Feynman Diagrams — QED Vertex Builder (2D)

Build and animate Feynman diagrams in 2D: draggable electron, positron and photon lines meeting at QED vertices. Six process presets (Moller scattering, Bhabha scattering, Compton scattering, pair production, annihilation, self-energy) plus a free construction mode with live vertex-conservation checking.

Electromagnetism2DAdvanced60 FPS📱 Mobile-adapted⇄ 3D version

Details

CategoryElectromagnetism

RenderingCanvas 2D

DifficultyAdvanced

Target FPS60

ControlsSelect interaction preset (Moller/Bhabha/Compton/pair production/annihilation/self-energy), Restart animation, Pause/Play, Speed slider, Scrub timeline by dragging on canvas, Switch to Build mode, Add electron line, Add positron line, Add photon line, Drag line endpoints to form vertices, Undo last line, Clear diagram

feynman-diagramsquantum-electrodynamicsparticle-physicsQEDspacetime-diagramvertex

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What This Simulation Shows

Feynman diagrams are 2D spacetime diagrams: one axis is time, the other is space. Straight arrowed lines are fermions (electrons/positrons), wavy lines are photons, and dots are vertices where a coupling-constant factor α ≈ 1/137 enters the amplitude. This page has two modes: Presets animates six real QED processes from initial state to final state, and Build lets you construct your own diagram from scratch — drag lines into place and the panel checks whether each meeting point is a valid QED vertex (two fermion ends + one photon end, conserving charge).

⚙ Under the hood

Build and animate Feynman diagrams in 2D: drag electron, positron and photon lines into place and watch them meet at QED vertices. Six real process presets — Moller scattering, Bhabha scattering, Compton scattering, pair production, annihilation and the self-energy loop — animate as spacetime diagrams, or switch to free-build mode where a live checker confirms each vertex conserves charge.

feynman-diagramsquantum-electrodynamicsparticle-physicsQEDspacetime-diagramvertex

2D · HTML5 Canvas 2D · 60 FPS target · runs fully client-side, no install