Axionic domain wall number related to U(1)${}_{\mathrm{anom}}$ global symmetry

Abstract

The QCD axion with $f_a$ at an intermediate scale, 10**9-10**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.

8 pages, 2 figures

References in corpus (3)

• New confining force solution of QCD axion domain wall problem
• Abelian discrete symmetries Z_{N} and Z_{nR} from string orbifolds
• Natural Higgs-flavor-democracy solution of the mu problem of supersymmetry and the QCD axion

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• Gravity wave and model-independent axion
• Strong CP problem, axions, and cosmological implications of CP violation