Natural tuning: Towards a proof of concept

Sergei Dubovsky, Victor Gorbenko, Mehrdad Mirbabayi

    Research output: Contribution to journalArticlepeer-review

    Abstract

    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
    Volume2013
    Issue number9
    DOIs
    StatePublished - 2013

    Keywords

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

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics

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