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Recorded: 2021/03/25 Released: 2021/09/12

Randy tells Jim about solutions in general relativity that allow for isolated bubbles of spacetime that could, possibly, travel faster than light.

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------------------------------------------- Notes:

1. Papers we both read for this program:

- Lobo, F.S.N. and M. Visser, "Fundamental Limitations on "Warp Drive" Spacetimes."
*Clas. Quant. Grav.*5871**21**, (2004) [arXiv] - Bobrick, A. and G. Maitre, "Introducing Physical Warp Drives."
*Clas. Quant. Grav.***38**, 105009 (2021) [arXiv]

- Lentz, E. " Breaking the Warp Barrier: Hyper-Fast Solitons in Einstein-Maxwell-Plasma Theory ."
*Clas. Quant. Grav.***38**075015 (2021) [arXiv] - Carmona, A., J.C. Ruiz, and, M. Neubert "A Warped Scalar Portal to Fermionic Dark Matter."
*Eur. Phys. J. C***81**, 58 (2021) [arXiv]

- Physics Frontiers 47: Bumetric Gravity
- Physics Frontiers 39: Negative Effective Mass
- Physics Frontiers 31: The Parameterized Post-Newtonian Framework
- Physics Frontiers 25: Gravitational Field Propulsion
- Physics Frontiers 7: Virtual Gravitational Dipoles

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