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Most people point to the second law of thermodynamics as the only law of physics that doesn't work the same way forwards and backwards in time. But in this video I explore how a single particle can break time reversal symmetry. I worked on the script and animations for this video for months with my friend Jorge Cham, the creator of PhD comics and his co-author physicist Daniel Whiteson. I'm glad to get to share it with you in time for Christmas in case you want to cancel vacation plans and perform experiments instead ;)

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This Particle Breaks Time Symmetry

Increasing entropy is NOT the only process that's asymmetric in time. Check out the book: http://WeHaveNoIdea.com This video was co-written by Daniel Whiteson and Jorge Cham You can also check out PhD Comics: http://phdcomics.com Special thanks to Patreon supporters: Tony Fadell, Donal Botkin, Michael Krugman, Jeff Straathof, Zach Mueller, Ron Neal, Nathan Hansen, Joshua Abenir Support Veritasium on Patreon: http://ve42.co/patreon Original paper on parity violation by the weak force by Lee and Yang: http://www.physics.utah.edu/~belz/phys5110/PhysRev.104.254.pdf More on B-meson oscillations and time reversal violation: Physics World Article: http://ve42.co/TimeReversal Original paper: https://arxiv.org/pdf/1410.1742.pdf https://en.wikipedia.org/wiki/B_meson Physics consultant: Prof. Stephen Bartlett Studio filming by Raquel Nuno

Comments

Mark

To be honest, this went WAY over my head, but I can certainly appreciate all that hard work that you two put into this... it shows!

Chris Jennings

superb presentation ... the mirrored XYZ is a great prop, and we the cartoon-ish images of fried theories :)