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The Strong CP Problem and Axions
Open accessAbstract
I describe how the QCD vacuum structure, necessary to resolve the U(1)_A problem, predicts the presence of a PabbrevPparity transformation, TabbrevTtime reversal transformation, and CPabbrevCPcharge conjugation transformation followed by party transformation violating term proportional to the vacuum angle θ. To agree with experimental bounds, however, this parameter must be very small (θ < 10-9). After briefly discussing some other possible solutions to this, so-called, strong CP problem, I concentrate on the chiral solution proposed by Peccei and Quinn which has associated with it a light pseudoscalar particle, the axion. I discuss in detail the properties and dynamics of axions, focusing particularly on invisible axion models where axions are very light, very weakly coupled, and very long-lived. Astrophysical and cosmological bounds on invisible axions are also briefly touched upon.
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Three‐Year Wilkinson Microwave Anisotropy Probe ( WMAP ) Observations: Implications for Cosmology
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Cited by
Theory and phenomenology of two-Higgs-doublet models
Branco, G. C., Ferreira, P. M., Lavoura, L., Rebelo, M. N., Sher, M., & Silva, J. P. (2012) · Physics Reports · doi:10.1016/j.physrep.2012.02.002 · Cited by 2,627
Modern theory of nuclear forces
Epelbaum, E., Hammer, H.-W., & Meißner, U.-G. (2009) · Reviews of Modern Physics · doi:10.1103/revmodphys.81.1773 · Cited by 1,883
Planck 2013 results. XXII. Constraints on inflation
Planck Collaboration, Ade, P. A. R., Aghanim, N., Armitage-Caplan, C., Arnaud, M., Ashdown, M., Atrio-Barandela, F., Aumont, J., Baccigalupi, C., Banday, A. J., et al. (2014) · Astronomy & Astrophysics · doi:10.1051/0004-6361/201321569 · Cited by 1,082
New experimental approaches in the search for axion-like particles
Irastorza, I. G., & Redondo, J. (2018) · Progress in Particle and Nuclear Physics · doi:10.1016/j.ppnp.2018.05.003 · Cited by 745
The landscape of QCD axion models
Di Luzio, L., Giannotti, M., Nardi, E., & Visinelli, L. (2020) · Physics Reports · doi:10.1016/j.physrep.2020.06.002 · Cited by 657
Metadata
- Authors
- Peccei, R. D.
- Venue
- Lecture Notes in Physics
- Publisher
- Springer Berlin Heidelberg
- Published
- 2008
- Volume
- 741
- Pages
- 3-17
- ISSN
- 0075-8450 (ISSN-L)
- OpenAlex
- W2130143500
- Cited by
- 369
- References
- 5
- FWCI
- 107.67
- Type
- book chapter
- Language
- en
- Open access
- green
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