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Recorded: 8/15/2019 Released: 11/23/2019

Randy introduces Jim to Sabine Hossenfelder's bimetric theory of gravity. This theory postulates two types of matter that don't interact directly with each other. They both do, however, interact with space-time gravitationally and so indirectly interact with each other.

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Notes:

1. The papers we read for this program:

- Hossenfelder, S., "Anti-Gravitation."
*Phys Lett B*,**6**(2005). [arXiv] - Hossenfelder, S., "A Bi-Metric Theory with Exchange Symmetry."
*Phys Rev D***78**044015 (2008). [arXiv] - Hohmann, M. and M. Wohlfarth, "No-go theorem for bimetric gravity with positive and negative mass."
*Phys Rev D***80**104011 (2009). [arXiv] - Hossenfelder, S., "Comment on 'No-go theorem for bimetric gravity with positive and negative mass.'"
*Phys Rev D***78**044015 (2009). [arXiv]

2. Related Episodes of Physics Frontiers:

3. Links Related to Sabine Hossenfelder:

- Sabine Hossenfelder's Backreaction blog.
- Sabine Hossenfelder's YouTube.
- The Perimeter Institute.

4. Some books we mentioned:

- Smolin, L.,
*The Trouble with Physics*.

5. 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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