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- W2740574265 abstract "The relaxion mechanism provides a potentially elegant solution to the hierarchy problem without resorting to anthropic or other fine-tuning arguments. This mechanism introduces an axion-like field, dubbed the relaxion, whose expectation value determines the electroweak hierarchy as well as the QCD strong $CP$-violating $overline{ensuremath{theta}}$ parameter. During an inflationary period, the Higgs mass squared is selected to be negative and hierarchically small in a theory which is consistent with 't Hooft's technical naturalness criteria. However, in the original model proposed by Graham, Kaplan, and Rajendran [Phys. Rev. Lett. 115, 221801 (2015)], the relaxion does not solve the strong $CP$ problem, and in fact contributes to it, as the coupling of the relaxion to the Higgs field and the introduction of a linear potential for the relaxion produces large strong $CP$ violation. We resolve this tension by considering inflation with a Hubble scale which is above the QCD scale but below the weak scale, and estimating the Hubble temperature dependence of the axion mass. The relaxion potential is thus very different during inflation than it is today. We find that provided the inflationary Hubble scale is between the weak scale and about 3 GeV, the relaxion resolves the hierarchy, strong $CP$, and dark matter problems in a way that is technically natural." @default.
- W2740574265 created "2017-08-08" @default.
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- W2740574265 date "2017-12-20" @default.
- W2740574265 modified "2023-10-01" @default.
- W2740574265 title "Relaxion: A landscape without anthropics" @default.
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- W2740574265 doi "https://doi.org/10.1103/physrevd.96.113007" @default.
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