Why This Universe? 98 - An Improbable Quantum Ghost Story (Ft. David Kaplan)
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Jan 19, 2026 David E. Kaplan, a theoretical particle physicist from Johns Hopkins, dives into the surreal world of nonlinear quantum mechanics. He discusses how this unexpected approach challenges traditional views of quantum theory and its implications on everything from the Higgs boson to dark matter. Kaplan introduces fascinating concepts like ghostly signals arising from superpositions that interact with one another. He shares insights on groundbreaking laboratory tests and the potential of nonlinearities to reshape our understanding of gravity and quantum fields.
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Linearity Enables Superposition
- Linearity means you can add two valid solutions to get a new valid solution of the Schrodinger equation.
- That mathematical superposition allows macroscopic combinations like being in two places at once in principle.
Schrödinger's Cat Illustrates The Measurement Puzzle
- Kaplan recounts Schrödinger's cat to show how linear quantum mechanics permits macroscopic superpositions.
- He emphasizes that no existing mathematical theory performs the sudden 'collapse' taught in classrooms.
Nonlinear Terms Fundamentally Change Quantum Mechanics
- Adding nonlinear terms to the Schrodinger equation breaks superposition and radically changes predictions.
- Historical attempts (de Broglie, Kibble, Weinberg) explored nonlinear modifications without fully addressing consequences.
