14 citations · 26 across the 3 of their papers we have counts for
3 papers
hep-ph2021
Cosmology of the companion-axion model: dark matter, gravitational waves, and primordial black holes
Zhe Chen, Archil Kobakhidze, Ciaran A. J. O'Hare +2
The companion-axion model introduces a second QCD axion to rescue the Peccei-Quinn solution to the strong-CP problem from the effects of colored gravitational instantons. As in sin…
hep-ph2021★ 12 cited
Phenomenology of the companion-axion model: photon couplings
Zhe Chen, Archil Kobakhidze, Ciaran A. J. O'Hare +2
We study the phenomenology of the 'companion-axion model' consisting of two coupled QCD axions. The second axion is required to rescue the Peccei-Quinn solution to the strong-CP pr…
hep-ph2021★ 14 cited
Coloured gravitational instantons, the strong CP problem and the companion axion solution
Zhe Chen, Archil Kobakhidze
Quantum gravity introduces a new source of the combined parity (CP) violation in gauge theories. We argue that this new CP violation gets bundled with the strong CP violation throu…