Cosmology of the companion-axion model: Dark matter, gravitational waves, and primordial black holes
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 single-axion models, the two axions predicted by the companion-axion model are attractive candidates for dark matter. The m...
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| Format: | Article |
| Language: | English |
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SciPost
2025-06-01
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| Series: | SciPost Physics |
| Online Access: | https://scipost.org/SciPostPhys.18.6.175 |
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