Core physics¶ The core of celeritas provides the physics and stepping loop implementation for the Celeritas codebase. Physics definition Celeritas parameters Geant4 integration Setting up problems Stepping mechanics Actions Initialization and execution Track sort order Step limits Discrete interactions User-input Range and energy loss Multiple scattering Geometry Propagation and magnetic field Propagation Field integration Magnetic field types Field data input and options Random number generation Engines Distributions Diagnostics celeritas::ActionDiagnostic celeritas::StepDiagnostic celeritas::SlotDiagnostic Step writers