Crunching Dilaton, Hidden Naturalness

Csaba Csáki, Raffaele Tito D'Agnolo, Michael Geller, Ameen Ismail

Research output: Contribution to journalArticlepeer-review


We introduce a new approach to the Higgs naturalness problem. The Higgs mixes with the dilaton of a conformal field theory (CFT) sector whose true ground state has a large negative vacuum energy. If the Higgs vacuum expectation value is nonzero and below O(TeV), the CFT admits a second metastable vacuum, where the expansion history of the Universe is conventional. As a result, only Hubble patches with unnaturally small values of the Higgs mass do not immediately crunch. The main experimental prediction of this mechanism is a dilaton in the 0.1-10 GeV range that mixes with the Higgs and can be detected at future colliders and experiments searching for weakly coupled particles.

Original languageEnglish
Article number091801
JournalPhysical Review Letters
Issue number9
StatePublished - 1 Mar 2021


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