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Relaxion Cosmology and the Price of Fine-Tuning · Around

2015

Relaxion Cosmology and the Price of Fine-Tuning

Di Chiara, Stefano, Kannike, Kristjan, Marzola, Luca et al.

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The relaxion scenario presents an intriguing extension of the standard model in which the particle introduced to solve to the strong CP problem, the axion, also achieves the dynamical relaxation of the Higgs boson mass term.

In this work we complete this framework by proposing a scenario of inflationary cosmology that is consistent with all the observational constraints: the relaxion hybrid inflation with an asymmetric waterfall.
In our scheme, the vacuum energy of the inflaton drives inflation in a natural way while the relaxion slow-rolls.
The constraints on the present inflationary observables are then matched through a subsequent inflationary epoch driven by the inflaton.

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