[W11] Lorenzo Ubaldi: Is the relaxion an axion?

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Is the Relaxion an Axion?

Lorenzo Ubaldi, Tel-Aviv University

Nicolás Bernal, ICTP-SAIFR, São Paulo.

I will review the recently proposed mechanism of cosmological relaxation of the electroweak scale, aimed at solving the hierarchy problem. The mechanism works with very tiny values of some couplings, which are acceptable as long as they are technically natural. I will argue that the few constructions proposed so far are not actually technically natural. Requiring a theoretically consistent framework leads to a cutoff around the electroweak scale. I will explain, with a calculable familon model, some ways we explored to raise the cutoff that could be relevant in addressing the little hierarchy problem.

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