1.3. Physical Principles¶

1.3.1. Geometry, Spacetime, and Motion¶

1.3.2. Reference Frames and Proper Objects¶

1.3.3. Conserved Quantities from Symmetry¶

1.3.3.1. Spacetime Translation and Energy-momentum¶

1.3.3.2. Spatial Rotation and Orbital Angular Momentum¶

1.3.3.3. Boost Acceleration and Boost Angular Momentum¶

1.3.3.4. Translation + Rotation and Spin Angular Momentum¶

1.3.4. Invariants as Particle Labels¶

1.3.5. Physical Action¶

1.3.5.1. Costs of Motion and Symmetries¶

1.3.5.2. Stationary Cost and Conservation¶

1.3.5.3. Dynamics from Stationary Cost¶

1.2. Formal Modeling 1.4. Formalisms