Cosmological Relaxation of the Electroweak Scale.

By P. Graham, D. Kaplan, S. Rajendran. Physical Review Letters, 2015

594 citations recorded by the source corpus.

A new class of solutions to the electroweak hierarchy problem is presented that does not require either weak-scale dynamics or anthropics. Dynamical evolution during the early Universe drives the Higgs boson mass to a value much smaller than the cutoff. The simplest model has the particle content of the standard model plus a QCD axion and an inflation sector. The highest cutoff achieved in any technically natural model is 10^{8} GeV.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/8ffd4f0b8554d8af9bc6c61cc4d91df97a6cfe2a

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Citations in the corpus

Expression of interest for the CODEX-b detector (2019, background): “Relaxion models rely on the cosmological evolution of a scalar field – the relaxion – to dynamically drive the weak scale towards an otherwise unnaturally low value [100].”
Weak gravity strongly constrains large-field axion inflation (2015, background): “Ultraviolet completions of other theories that apply large field ranges to the hierarchy problem [82] or to generating a light dilaton [83–85] may be susceptible to similar constraints.”
AION: an atom interferometer observatory and network (2019, background): “Prominent among these ultra-light scalar bosons are many well-motivated DM candidates (for reviews, see [26, 27]), such as dilatons, moduli and the relaxion [28], as well as the pseudoscalar QCD axion and axion-like-particles (ALPs) [29], and (dark) vector bosons [30].”
Matter-wave Atomic Gradiometer Interferometric Sensor (MAGIS-100) (2021, unknown): “Potential dark matter candidates within this range include, for spin-0, the QCD axion [109–112], axion-like-particles and ultralight string moduli [113], the relaxion [114], and for spin 1, the dark photon [113].”
CMB-S4 Science Case, Reference Design, and Project Plan (2019, background): “New light particles may arise in the form of axions and sterile neutrinos, or can appear as a byproduct of new symmteries that would explain the small mass of the Higgs boson [142, 143, 144, 145, 146, 147, 148, 10, 149, 150, 151, 152, 11, 153, 154, 141, 155, 12, 156, 157, 158, 159].”
What is the γγ resonance at 750 GeV? (2015, background): “The electroweak scale could be linked to the new strong interactions in a more subtle way as in [35] or [36] or because of dark matter.”
Revised constraints and Belle II sensitivity for visible and invisible axion-like particles (2017, background): “Moreover, it has been pointed out that ALPs may play a crucial role in electroweak symmetry breaking and the solution of the hierarchy problem [31] via the so-called relaxion mechanism [32].”
Beyond the Standard Model Physics at the HL-LHC and HE-LHC (2018, background): “Schlaffer The relaxion mechanism [553] addresses the hierarchy problem differently than conventional symmetry-based solutions.”
Recent Progress in the Physics of Axions and Axion-Like Particles (2020, methodology): “In the original model [10], it is done by the Hubble friction over a long period of inflationary expansion.”