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Paper-boat relaxion
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abstract
A new relaxion mechanism is proposed where a small electroweak scale is preferably selected earlier than the larger one due to a potential instability, which is different from previously proposed stopping mechanisms by either Hubble friction from an increasing periodic barrier or thermal friction from gauge boson production. The sub-Planckian field excursion of an axion can be achieved without violating the bound on the $e$-folding number from a quantum gravity perspective; and our relaxion can be identified as a QCD axion, preserving the Peccei-Quinn solution to the strong $CP$ problem as well as making up all the cold dark matter in our current Universe.
Forward citations
Cited by 1 Pith paper
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Vacuum Metastability from Axion-Higgs Criticality
An ALP-Higgs coupling can lower the vacuum instability scale to near the weak scale, predicting an axion-like particle between 1 MeV and 20 GeV that future experiments can fully probe.
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