Axionic domain wall number related to U(1)anom global symmetry
The QCD axion with fa at an intermediate scale, 109 GeV∼1012 GeV, seems in conflict with the gravity spoil of global symmetries and may face the axionic domain wall problem. We point out that the string compactifications with an anomalous U(1) gauge symmetry, allowing desirable chiral matter spectra...
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| Format: | Article |
| Language: | English |
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Elsevier
2016-08-01
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| Series: | Physics Letters B |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269316301885 |