科研之友
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摘要
The QCD axion with f(a) at an intermediate scale, 10(9) GeV similar to 10(12) 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, circumvent these two problems simultaneously.
- 出版日期2016-8-10
