Enhanced axion–photon coupling in GUT with hidden photon
We show that the axion coupling to photons can be enhanced in simple models with a single Peccei–Quinn field, if the gauge coupling unification is realized by a large kinetic mixing χ=O(0.1) between hypercharge and unbroken hidden U(1)H. The key observation is that the U(1)H gauge coupling should be...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2018-05-01
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| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269318302284 |