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Is faster-than-light (FTL) travel possible? In most discussions of this, we get hung up on the physics of particular ideas, such as wormholes or warp drives. But today, we take a more zoomed out approach that addresses all FTL propulsion - as well as FTL messaging. Because it turns out that they all allow for time travel. Join us today as we explore why this is so and the profound consequences that ensue. Written & presented by Prof David Kipping. Special thanks to Prof Matt Buckley for fact checking and his great blog article that inspired this video (http://www.physicsmatt.com/blog/2016/8/25/why-ftl-implies-time-travel). \u2192 Support our research: https://www.coolworldslab.com/support \u2192 Get Stash! https://teespring.com/stores/cool-worlds-store THANK-YOU to our supporters D. Smith, M. Sloan, C. Bottaccini, D. Daughaday, A. Jones, S. Brownlee, N. Kildal, Z. Star, E. West, T. Zajonc, C. Wolfred, L. Skov, G. Benson, A. De Vaal, M. Elliott, B. Daniluk, M. Forbes, S. Vystoropskyi, S. Lee, Z. Danielson, C. Fitzgerald, C. Souter, M. Gillette, T. Jeffcoat, H. Jensen, J. Rockett, N. Fredrickson, D. Holland, E. Hanway, D. Murphree, S. Hannum, T. Donkin, K. Myers, A. Schoen, K. Dabrowski, J. Black, R. Ramezankhani, J. Armstrong, K. Weber, S. Marks, L. Robinson, F. Van Exter, S. Roulier, B. Smith, P. Masterson, R. Sievers, G. Canterbury, J. ****, J. Cassese, J. Kruger, S. Way, P. Finch, S. Applegate, L. Watson, T. Wheeler, E. Zahnle, N. Gebben, J. Bergman, E. Dessoi, J. Alexander, C. Macdonald, M. Hedlund, P. Kaup, C. Hays, S. Krasner, W. Evans, J. Curtin, J. Sturm, RAND Corp, T. Kordell, T. Ljungberg & M. Janke. ::References:: \u25ba Alcubierre, M., 1994, The warp drive: hyper-fast travel within general relativity, Classical and Quantum Gravity, 11 L73: https://arxiv.org/abs/gr-qc/0009013 \u25ba Alcubierre & Lobo (2021), Warp drive basics, https://arxiv.org/abs/2103.05610 \u25ba Pfenning, M. & Ford, L., 1997, The unphysical nature of Warp Drive, Classical and Quantum Gravity, 14, 1743: https://arxiv.org/abs/gr-qc/9702026 \u25ba Finazzi, S., Liberati, S., Barceló, C., 2009, Semiclassical instability of dynamical warp drives, Physical Review D., 79, 124017: https://arxiv.org/abs/0904.0141 \u25ba McMonigal, B., Lewis, G., O'Byrne, P., 2012, Alcubierre warp drive: On the matter of matter, Physical Review D., 85, 064024: https://arxiv.org/abs/1202.5708 \u25ba Everett, A., 1996, Warp drive and causality, Physical Review D, 53, 7365: https://journals.aps.org/prd/abstract/10.1103/PhysRevD.53.7365 \u25ba For a more rigorous breakdown of the axis flipping in Minkowski spacetime, see Chapter 3 of "Special Relativity" by Valerio Faraoni (https://williamsgj.people.cofc.edu/Minkowski%20Spacetime.pdf) ::Music:: Music licensed by SoundStripe.com (**) [shorturl.at/ptBHI], or via Creative Commons (CC) Attribution License (https://creativecommons.org/licenses/by/4.0/), or with permission from the artist \u25ba Hill - An Interesting Retirement [https://open.spotify.com/album/3S2hu2EP1lYOXHzwEHcclb] \u25ba Joachim Heinrich - Stjärna \u25ba Falls - Life In Binary \u25ba Chris Zabriskie - Cylinder Two \u25ba Chris Zabriskie - Cylinder Five \u25ba Chris Zabriskie - Cylinder Four \u25ba Falls - Ripley \u25ba Caleb Etheridge - Always Dreaming \u25ba Joachim Heinrich - Y \u25ba Indive - Trace Correction ::Film/TV clips used:: \u25ba Interstellar (2014) Paramount Pictures \u25ba Contact (1997) Warnes Bros. \u25ba The Imitation Game (2014) The Weinstein Company \u25ba Star Trek: Generations (1994) Paramount Pictures \u25ba Cosmos: Possible Worlds (2020) National Geographic Fox \u25ba Stephen Hawking's Favorite Places (2016) Curiosity Stream \u25ba Star Wars: The Empire Strikes Back (1980) 20th Century Fox \u25ba Star Trek: Deep Space Nine (1993-1999) Paramount Television \u25ba The Day The Earth Stood Still (2008) 20th Century Fox \u25ba Stargate (1994) MGM/UA Distribution Co. \u25ba Star Trek: Beyond (2016) Paramount Pictures \u25ba Star Trek IV: The Voyage Home (1986) Paramount Pictures \u25ba The Expanse (2015-2022) Legendary Television Distribution \u25ba Star Trek: The Next Generation (1987-1994) Paramount Television \u25ba Avengers: Endgame (2019) Walt Disney Studios Motion Pictures \u25ba Star Trek: Enterprise (2001-2005) Paramount Television \u25ba Back To The Future (1985) Universal Pictures \u25ba Passengers (2016) Sony Pictures Releasing \u25ba The Time Machine (Dreamworks) \u25ba Alien: Covenant (2017) 20th Century Fox \u25ba Star Trek (1966-1969) Paramount Television \u25ba Tenet (2020) Warner Bros. Pictures \u25ba Loki (2021-) Marvel Studios \u25ba Somewhere In Time (1980) Universal Pictures \u25ba The Assassination of Jesse James by the Coward Robert Ford (2007) Warner Bros. Pictures \u25ba Star Trek: Into Darkness (2013) Paramount Pictures \u25ba Logan (2017) 20th Century Fox \u25ba Star Trek: First Contact (1996) Paramount Pictures ::Subtitles:: \u25ba German by Frischholz Christian ::Chapters:: 00:00 Introduction 06:52 Space Time Diagrams 12:51 Causality Violations 17:01 Paradoxes in Time 24:28 Outro and Credits #FasterThanLight #Alcubierre #CoolWorlds