String compactification, QCD axion and axion-photon-photon coupling

Kang Sin Choi; Lan Woo Kim; Jihn E. Kim

doi:10.1088/1126-6708/2007/03/116

String compactification, QCD axion and axion-photon-photon coupling

Kang Sin Choi, Lan Woo Kim, Jihn E. Kim

Scranton Honors Program

Research output: Contribution to journal › Article › peer-review

41 Scopus citations

Abstract

It is pointed out that there exist a few problems to be overcome toward an observable sub-eV QCD axion in superstring compactification. We give a general expression for the axion decay constant. For a large domain wall number Now, the axion decay constant can be substantially lowered from a generic value of a scalar singlet VEV. The Yukawa coupling structure in the recent Z_12-1 model is studied completely, including the needed nonrenormalizable terms toward realistic quark and lepton masses. In this model we find an approximate global symmetry and vacuum so that a QCD axion results but its decay constant is at the GUT scale. The axion-photon-photon coupling is calculated with a reasonable assumption on a realistic vacuum satisfying the quark and lepton mass matrix conditions. It is the first time calculation of c _αγγ in realistic string compactifications: C _αγγ= 5/3- 1.93 ≃ -0.26.

Original language	English
Journal	Journal of High Energy Physics
Volume	2007
Issue number	3
DOIs	https://doi.org/10.1088/1126-6708/2007/03/116
State	Published - 1 Mar 2007

Keywords

GUT
Global symmetries compactification and string models
Quark masses and SM parameters

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10.1088/1126-6708/2007/03/116

Cite this

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AB - It is pointed out that there exist a few problems to be overcome toward an observable sub-eV QCD axion in superstring compactification. We give a general expression for the axion decay constant. For a large domain wall number Now, the axion decay constant can be substantially lowered from a generic value of a scalar singlet VEV. The Yukawa coupling structure in the recent Z12-1 model is studied completely, including the needed nonrenormalizable terms toward realistic quark and lepton masses. In this model we find an approximate global symmetry and vacuum so that a QCD axion results but its decay constant is at the GUT scale. The axion-photon-photon coupling is calculated with a reasonable assumption on a realistic vacuum satisfying the quark and lepton mass matrix conditions. It is the first time calculation of c αγγ in realistic string compactifications: C αγγ= 5/3- 1.93 ≃ -0.26.

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String compactification, QCD axion and axion-photon-photon coupling

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Keywords

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