TASI lectures on the strong CP problem

parameter of QCD. After an introduction to anomalies in four and two dimensions, the parameter is introduced. That such topological parameters can have physical effects is illustrated with two dimensional models, and then explained in QCD using instantons and current algebra. Possible solutions including axions, a massless up quark, and spontaneous CP violation are discussed.

lectures: Boulder 2000/06/04
strong interaction: CP
quantum chromodynamics: Theta parameter
anomaly
dimension: 4
dimension: 2
instanton
current algebra
axion
quark: massless

References(22)

Figures(0)

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(
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Ann E. Nelson
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R.D. Peccei
(
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(
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R.D. Peccei
(
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,
Helen R. Quinn
(
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)

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(
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)

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Pierre Sikivie
(
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)

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•
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•
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Michael S. Turner
(
)

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•
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