Natural tuning: Towards a proof of concept

Sergei Dubovsky, Victor Gorbenko, Mehrdad Mirbabayi

    Research output: Contribution to journalArticle


    The cosmological constant problem and the absence of new natural physics at the electroweak scale, if confirmed by the LHC, may either indicate that the nature is fine-tuned or that a refined notion of naturalness is required. We construct a family of toy UV complete quantum theories providing a proof of concept for the second possibility. Low energy physics is described by a tuned effective field theory, which exhibits relevant interactions not protected by any symmetries and separated by an arbitrary large mass gap from the new "gravitational" physics, represented by a set of irrelevant operators. Nevertheless, the only available language to describe dynamics at all energy scales does not require any fine-tuning. The interesting novel feature of this construction is that UV physics is not described by a fixed point, but rather exhibits asymptotic fragility. Observation of additional unprotected scalars at the LHC would be a smoking gun for this scenario. Natural tuning also favors TeV scale unification.

    Original languageEnglish (US)
    Article number45
    JournalJournal of High Energy Physics
    Issue number9
    StatePublished - Jan 1 2013


    • Exact S-Matrix
    • Models of Quantum Gravity
    • Standard Model

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics

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