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Recorded: 10/15/2017 Released: 5/15/2018

Jim and Randy discuss the ways in which different modified gravities mimic the observed dark energy in the universe, contra a cosmological constant hypothesis. They talk about various forms of modified gravity theories and the particles associated with their "fifth fields."

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Notes:

1. The papers we read for this program:

- Carroll, S., Vikram, D., Trodden, M., and Turner, M., "Is Cosmic Speed-Up Due to New Gravitational Physics." Phys Rev D 70, 043528(R) (2005). [arXiv]
- Joyce, A., Lombriser, L., and Schmidt, F. " Dark Energy Versus Modified Gravity." Annu. Rev. Nuc. Part. Sci. 66, 95 (2016). [arXiv

2. My review of Will's book, which I talk about a little too much in this podcast.

3. Related Episodes of Physics Frontiers:

- Physics Frontiers 33: The Positive Energy Theorem
- Physics Frontiers 31: Post-Newtonian Gravitation
- 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
- Physics Frontiers 1: G4V: The Gravitational 4-Vector Formulation of Gravity

4. Please visit and comment on our subreddit, and if you can help us keep this going by contributing to our Patreon, we'd be grateful.

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