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Primordial Magnetic Fields and the Peccei-Quinn Scale
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astro-ph
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magneticprimordialfieldspq-constantscaleaxionboundclose
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A strong primordial magnetic field can induce a relaxation of the present bound on the PQ-constant. We show that, considering the present limits on primordial magnetic fields, a value for the PQ-constant very close to the GUT scale is not excluded. This result naturally opens the possibility for the axion to be defined in the context of the GUT theories.
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