TY - JOUR
T1 - The grand unified axion not observable?
AU - Ellis, John
AU - Gaillard, Mary K.
AU - Nanopoulos, D. V.
AU - Rudaz, Serge
PY - 1981/11/12
Y1 - 1981/11/12
N2 - It is a characteristic of grand unified theories with an axion of the type suggested by Dine, Fischler and Srednicki that they predict a very small neutron electric dipole moment because the QCD θ vacuum parameter is suppressed. The minimal SU(5) axion model of Wise, Georgi and Glashow yields a cosmological baryon-to-photon ratio in the same order as that in the minimal SU(5) model with one 5 of Higgs, which is much smaller than required by astrophysics. More complicated grand unified axion models can avoid this problem.
AB - It is a characteristic of grand unified theories with an axion of the type suggested by Dine, Fischler and Srednicki that they predict a very small neutron electric dipole moment because the QCD θ vacuum parameter is suppressed. The minimal SU(5) axion model of Wise, Georgi and Glashow yields a cosmological baryon-to-photon ratio in the same order as that in the minimal SU(5) model with one 5 of Higgs, which is much smaller than required by astrophysics. More complicated grand unified axion models can avoid this problem.
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U2 - 10.1016/0370-2693(81)90540-2
DO - 10.1016/0370-2693(81)90540-2
M3 - Article
AN - SCOPUS:49049151167
SN - 0370-2693
VL - 106
SP - 298
EP - 302
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 4
ER -