### 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 language | English (US) |
---|---|

Article number | 045 |

Journal | Journal of High Energy Physics |

Volume | 2013 |

Issue number | 9 |

DOIs | |

State | Published - 2013 |

### Fingerprint

### Keywords

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

### ASJC Scopus subject areas

- Nuclear and High Energy Physics

### Cite this

*Journal of High Energy Physics*,

*2013*(9), [045]. https://doi.org/10.1007/JHEP09(2013)045

**Natural tuning : Towards a proof of concept.** / Dubovsky, Sergei; Gorbenko, Victor; Mirbabayi, Mehrdad.

Research output: Contribution to journal › Article

*Journal of High Energy Physics*, vol. 2013, no. 9, 045. https://doi.org/10.1007/JHEP09(2013)045

}

TY - JOUR

T1 - Natural tuning

T2 - Towards a proof of concept

AU - Dubovsky, Sergei

AU - Gorbenko, Victor

AU - Mirbabayi, Mehrdad

PY - 2013

Y1 - 2013

N2 - 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.

AB - 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.

KW - Exact S-Matrix

KW - Models of Quantum Gravity

KW - Standard Model

UR - http://www.scopus.com/inward/record.url?scp=84884575249&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84884575249&partnerID=8YFLogxK

U2 - 10.1007/JHEP09(2013)045

DO - 10.1007/JHEP09(2013)045

M3 - Article

VL - 2013

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

SN - 1126-6708

IS - 9

M1 - 045

ER -