In this quirky Veritasium deep-dive, Derek Muller unpacks how Paul Dirac’s insistence on negative energy solutions forced physicists to rethink quantum mechanics and relativity—and ultimately predict the existence of antiparticles. Along the way you’ll get a whirlwind tour of the Schrödinger and Klein-Gordon equations, Heisenberg’s uncertainty principle, the Dirac equation itself, and the mind-bending notion that antiparticles might travel “backwards” in time, leading to the discovery of the positron and a glimpse of an “anti-world.”
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