Strong CP Problem
Concept
the observation that the θ angle in quantum chromodynamics that would violate CP symmetry seems fine-tuned to 0
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Videos Mentioning Strong CP Problem
Frank Wilczek: Physics of Quarks, Dark Matter, Complexity, Life & Aliens | Lex Fridman Podcast #187
Lex Fridman
A puzzling aspect of the strong interaction related to the near-but-not-exact symmetry under time reversal, for which axions are proposed as a solution.
What's Going Wrong in Particle Physics? (This is why I lost faith in science.)
Sabine Hossenfelder
A problem in particle physics concerning why the Theta parameter in the strong nuclear force is experimentally found to be zero or very small, which would otherwise violate CP symmetry.