Within Reason #57 David Deutsch - The Multiverse is Real
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Mar 5, 2024 
The podcast delves into the multiverse theory, quantum mechanics, and the wave-particle duality of particles. It explores various quantum interpretations, the necessity of a multiverse for solid matter existence, and the challenges of coherence maintenance in quantum systems. The conversation also covers the philosophical implications of quantum theory and the challenge of understanding vast numbers and complex shapes in physics and astronomy.
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Multiverse Confidence
- Deutsch's confidence in the multiverse stems from his trust in quantum theory, similar to his trust in evolution.
- He views the multiverse not as conjecture, but as the best explanation for observed phenomena, like interference patterns.
Two-Slit Experiment and Multiverse
- The two-slit experiment demonstrates that photons exist in multiple copies, interfering with each other.
- Opening a second slit can stop photons from arriving at certain points, indicating their awareness of both slits.
Flaws in Copenhagen Interpretation
- The Copenhagen interpretation, claiming quantum theory only applies microscopically, is flawed.
- Quantum theory, by its mathematics, applies to all scales, evidenced by phenomena like the photoelectric effect and quantized spin.