Why Born Probabilities?
Talkat Quantum Physics and Statistical Causal Models (Simons Institute workshop, 2022) · 2022-04-27..04-29
summary
Argues that Born probabilities can emerge from unitary quantum mechanics if the global state includes a high-entropy quantum noise background and observations are counted as physical computations. Uses decoherence, density matrices, and a many-computations interpretation (Mallah) to model when subsystems can perform reliable memory and prediction. Shows coarse-graining and signal-to-noise averaging force the number of viable observations to scale like psi squared (example: 0.8^2 = 64%), introducing the State Crowding Amplitude Level cutoff.
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chapters (7)
- 0:00Is Unitary QM Consistent with Born Proba
- 10:48Density matrix evolution: lose off diagonal terms between macro-distinct states.
- 15:52Wallace et al.: It's Gotta be Born, or Else! In the presence of widespread, generic violation of diachronic consistency agency in the Everett universe is not possible at all.
- 19:59What is counted?
- 21:54Mallah's Many Computations
- 26:46How many computations?
- 28:03Philosophy