= Gravitational field theory

• 2-step field description

field eqn eqn motion

source particle ? field ? test particle

• Einstein: Gravitation field = curved spacetime

Spacetime tells matter how to move

Matter tells spacetime how to curve

• Field equation: (Electromagnetism: Maxwell’s eqn) GR: Einstein’s eqn Gmn = (- 8pGN/c4) Tmn

geometry matter/energy

GR field eqn

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