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3 Tests of Post-Newtonian Gravity

 3.1 Metric theories of gravity and the strong equivalence principle
  3.1.1 Universal coupling and the metric postulates
  3.1.2 The strong equivalence principle
 3.2 The parametrized post-Newtonian formalism
 3.3 Competing theories of gravity
  3.3.1 General relativity
  3.3.2 Scalar-tensor theories
  3.3.3 Vector-tensor theories
 3.4 Tests of the parameter γ
  3.4.1 The deflection of light
  3.4.2 The time delay of light
  3.4.3 Shapiro time delay and the speed of gravity
 3.5 The perihelion shift of Mercury
 3.6 Tests of the strong equivalence principle
  3.6.1 The Nordtvedt effect and the lunar Eötvös experiment
  3.6.2 Preferred-frame and preferred-location effects
  3.6.3 Constancy of the Newtonian gravitational constant
 3.7 Other tests of post-Newtonian gravity
  3.7.1 Search for gravitomagnetism
  3.7.2 Geodetic precession
  3.7.3 Tests of post-Newtonian conservation laws
 3.8 Prospects for improved PPN parameter values

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