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Completing Canonical Quantization PowerPoint Presentation

Completing Canonical Quantization

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Something Strange

L. Landau, E.M. Lifshitz, Quantum mechanics:

Non-relativistic theory, 3rd ed., Pergamon Press,

1977.

"Thus quantum mechanics occupies a very unusual

place among physical theories: it contains classical

mechanics as a limiting case, yet at the same time it

requires this limiting case for its own formulation."

The Principles of Quantum Mechanics

List of Topics

1 Classical/Quantum connection

“Enhanced Quantization”

Canonical & Affine quantization Enhanced classical theories

2 Two toy models

3 Rotationally symmetric models

TOPIC 1

- Classical & Quantum formalism
- Canonical coherent states
- Classical Quantum formalism
- Canonical transformations
- Cartesian coordinates
- Affine vs. canonical variables
- Affine quantization as canonical quantization

Action Principle Formulations

VERY DIFFERENT

Unification of Classical and Quantum (1)

?

Macroscopic variations of Microscopic states:

Basic state: Translated basic state: Translated Fourier state: Coherent states:

s.a.

Unification of Classical and Quantum (2)

subset

CLASSICAL MECHANICS IS QUANTUM MECHANICS RESTRICTED TO A CERTAIN TWO DIMENSIONAL SURFACE IN HILBERT SPACE

Is There More? (2)

- Are there other two-dimensional sheets of normalized Hilbert space vectors that may be used in restricting the quantum action and which lead to an enhanced classical canonical formalism?

Is There More? (2)

- Are there other two-dimensional sheets of normalized Hilbert space vectors that may be used in restricting the quantum action and which lead to an enhanced classical canonical formalism?

YES !

Affine Quantization (1) (2)

subset

The Q/C Connection : Summary (2)

- The classical action arises by a restriction of the quantum action to coherent states
- Canonical quantization uses P and Q which must be self adjoint
- Affine quantization uses D and Q which are selfadjoint when Q > 0 (and/or Q < 0)
- Both canonical AND affine quantum versions are consistent with classical, canonical phase space variables p and q
- Now for some applications!

TOPIC 2 (2)

- Solutions of the first model have singularities
- Canonical quantum corrections
- Affine quantum corrections
- Affine quantization resolves singularities!
- A second classical model is similar

Toy Model - 1 (2)

Toy Model - 2 (2)

Enhanced Toy Models : Summary (2)

- Classical toy models exhibit singular solutions for all positive energies
- Enhanced classical theory with canonical quantum corrections still exhibits singularities
- Enhanced classical theory with affine quantum corrections removes all singularities
- Enhanced quantization can eliminate singularities

TOPIC 3 (2)

- Rotationally symmetric models
- Free quantum models for
- Interacting quantum models for
- Reducible operator representation is the key

. . .

Rotationally Sym. Models (2) (2)

A free theory!

Rot. Sym. Models : Summary (2)

- Conventional quantization works if N is finite but leads totriviality if N is infinite
- Enhanced quantization applies even for reducible operator representations
- Using the Weak Correspondence Principle
a nontrivial quantization results if N is finite or N is infinite---withNOdivergences!

- Class. & Quant. formalism is similar for all N

WHAT HAS BEEN ACCOMPLISHED ??

Canonical (2)vs. Enhanced

- Canonical quantization requires Cartesian coordinates, but WHY is not clear
- Canonical quantization works well for certain problems, but NOT for all problems
- Enhanced quantization clarifies coordinate transformations and Cartesian coordinates
- Enhanced quantization can yield canonical results -- OR provide proper results when canonical quantization fails

Other Enh. Quant. Projects (2)

- Simple models of affine quantization eliminating classical singularities (on going)
- Covariant scalar models (done)
- Affine quantum gravity (started)
- Incorporating constrained systems within enhanced quantization (started)
- Additional sheets of vectors in Hilbert space relating quan. and class. models (started)
- Extension to fermion fields (hints)

Thank You (2)

References (2)

- ``Enhanced Quantization: A Primer'', J.Phys. A: Math. Theor.45, 285304
(8pp) (2012); arXiv:1204.2870

- ``Enhanced Quantization on the Circle’’; Phys. Scr. 87 035006 (5pp) (2013); arXiv:1206.1180
- ``Enhanced Quantum Procedures that Resolve Difficult Problems’’; arXiv: 1206.4017
- ``Revisiting Canonical Quantization’’; arXiv: 1211.735

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