Abstract
The massless gauge boson of an extra U(1) symmetry - the paraphoton - could have low-energy effective couplings to ordinary matter. The coupling to electrons would behave much like the invisible axion-electron coupling at keV energies. We find astrophysical bounds on the paraphoton-electron coupling strength: α Γee <1.5 × 10 −22 (sun), and α Γee ≲10 −26 (while dwarfs). We also show that planned solar axion detectors would not distinguish axions and paraphotons.
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