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Quantum Theory The worst scientific theory of all time Dr Mark J Hadley Dept of Physics

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Plan Introduction to QT Why it is bad A bad theory of classical Mechanics –Classical probability Why the quantum world is different –Why QT is a bad response An alternative to QT

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Quantum theory Predictions are intrinsically probabilistic. A state is represented by a vector, , in a complex Hilbert space. contains the maximum possible amount of information. A rule to get probabilities from . A rule to describe the evolution of .

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Includes Quantum mechanics Quantum Field Theory String Theory

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How bad? 1.Quantum Theory 2.Genesis 3... 4.. 5..

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Why is it so bad? Fails to explain Nature –What is an elementary particle Particle spectrum Fundamental forces –What is happening in an experiment Prevents progress

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(x)(x) Gives probability information only. It is not the particle. It does not exist. It requires a new meaning to probability Cannot say what a particle is.. where it is… what it is doing.

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A bad theory of classical mechanics Throwing a projectile at a target. (r, ) describes the probability of a certain result. (r, ,z,t) describes the evolving wave- packet. Nothing else can be said about the projectile

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A dice throw (n) gives the probability of a particular result. The throw is governed by classical mechanics. (n) = 1/6 Why?

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(n) evens high lucky

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(n)= 1/6 Not from Newtonian mechanics Structure Phase space of initial conditions + Deterministic evolution = Space of final conditions Symmetry Nothing else

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Structural Implications 1 2 3 4 5 6 Phase-space of initial conditions (n) Boolean Logic Deterministic evolution

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Classical Probabilities Satisfy Boolean Logic Are a measure of our ignorance of initial conditions. Can always be represented as Volume integrals.

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Quantum Theory Probabilities Do not satisfy Boolean Logic Are represented by projections of a vector Are an intrinsic feature of Nature A completely new meaning to probability

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Classical and Quantum worlds are very, very similar. For a single experiment –Can use classical probabilities Boolean Logic Individual trajectories No complex wave function For incompatible experiments –Cannot construct a single phase-space of initial conditions that gives the observed results.

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The quantum World is context dependent QT is one response –It hides the difference State => Evolution => results –At a cost A new meaning to probability No underlying explanation

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The quantum World is context dependent Explain it with an existing theory –Sensible Explain it with a brilliant new theory –Genius Don’t explain it –Pragmatist Deny that anything needs explaining –Philosopher

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The quantum World is context dependent Explain it with an existing theory –lazy Explain it with a brilliant new theory –insane Don’t explain it –loser Deny that anything needs explaining –bad loser

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Using an existing theory Choice between: 1.GR 2.GR 3.GR

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GR and QT Can GR explain context dependent effects? –Yes Will it agree with QT predictions? –Yes it has to Structure + Symmetry & Continuity = all equations of QT

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Using GR GR allows a non-trivial causal structure –Measurement apparatus can set additional boundary conditions Any Geometric theory of spacetime can have the same structure

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From GR to QT Can GR get the equations of QT directly? –No (Not yet) –But remember (n)= 1/6

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Progress The Logic of Quantum Mechanics Derived From Classical General Relativity Foundations of Physics Letters Vol 10, No.1, (1997) 43-60. Topology change and context dependence International Journal of Theoretical Physics Vol. 38 (1999) 1481 Charge and the topology of spacetime Class. Quantum Grav. 16 No 11 (November 1999) 3567-3577 Spin half in classical general relativity Class. Quantum Grav. 17 No 20 (October 2000) 4187-4194 The orientability of spacetime Class. Quantum Grav. 19 (August 2002) 4565-4571

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The Quantum World Explain it with an existing theory –GR (sensible) Explain it with a brilliant new theory –insane Don’t explain it –loser Deny that anything needs explaining –Quantum Theory (bad loser)

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