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Recorded: 11/12/2017 Released: 6/8/2018

Randy and Jim discuss the Parameterized Post-Newtonian Framework, a generalized way to compare metric theories of gravity to experiment in a standardized way. In this episode we discuss several theories of gravity and how they hold up under the light of experimental data.

_{}

^{}

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- γ (gamma) - Coupling of matter to curvature, GR = 1 , Newton = 0
- β (beta) - Linearity of superposition, GR = 1 - Superposition linear
- ξ (xi) - Preferred location effects, GR = 0 - Spatially homogeneous
- α
_{1}(alpha) - Preferred frame effects, GR = 0 - Lorentz invariant - α
_{2}(alpha) - Preferred frame effects, GR = 0 - Lorentz invariant - α
_{3}(alpha) - Preferred frame effects, GR = 0 - Lorentz invariant - ζ
_{1}(zeta) - Momentum changes, GR = 0 - Momentum conserved - ζ
_{2}(zeta) - Momentum changes, GR = 0 - Momentum conserved - ζ
_{3}(zeta) - Momentum changes, GR = 0 - Momentum conserved - ζ
_{4}(zeta) - Momentum changes, GR = 0 - Momentum conserved

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Notes:

1. The paper we read for this program (only sections 3 and 4):

- Griffiths, R., "The Confrontation between General Relativity and Experiment" Living Rev. Relativ. 17:4 (2014). [arXiv]

3. Related Episodes of Physics Frontiers:

- Physics Frontiers 33: The Positive Energy Theorem
- Physics Frontiers 29: Gravitational Alternatives to Dark Energy
- Physics Frontiers 27: Gravitational Equivalence Principles
- Physics Frontiers 23: Dark Energy
- Physics Frontiers 10: Requirements for Gravitational Theories
- Physics Frontiers 9: f(R) Theories of Gravity

4. If you have any information about good packages for numerical relativity for Randy, please leave them in the comments.

5. Our subreddit.

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