QCD axions constrain F-theory base threefolds to have rigid or flux-rigidified divisors, yielding typical axion masses around 10^{-9} eV and decay constants near 10^{15} GeV in allowed regions.
(123) We compute the mass and decay constants for the two axions m1 ≈4.0×10 26eV, 1 fa′ 1 ≈3.2×10 −17GeV−1 , m2 ≈1.4×10 −9eV, 1 fa′ 2 ≈2.2×10 −16GeV−1
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Constraining F-theory Model Building with QCD Axions
QCD axions constrain F-theory base threefolds to have rigid or flux-rigidified divisors, yielding typical axion masses around 10^{-9} eV and decay constants near 10^{15} GeV in allowed regions.