Scale invariant extension of the Standard Model: a nightmare scenario in 
cosmology

Aoki, Mayumi; Kubo, Jisuke; Yang, Jinbo

doi:10.1088/1475-7516/2024/05/096

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Scale invariant extension of the Standard Model: a nightmare scenario in cosmology

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Kubo, Jisuke
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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https://iopscience.iop.org/article/10.1088/1475-7516/2024/05/096/pdf
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Citation

Aoki, M., Kubo, J., & Yang, J. (2024). Scale invariant extension of the Standard Model: a nightmare scenario in cosmology. Journal of Cosmology and Astroparticle Physics, 2024(5): 96. doi:10.1088/1475-7516/2024/05/096.

Cite as: https://hdl.handle.net/21.11116/0000-000F-5085-0

Abstract

Inflationary observables of a classically scale invariant model, in which the origin of the Planck mass and the electroweak scale including the right-handed neutrino mass is chiral symmetry breaking in a QCD-like hidden sector, are studied. Despite a three-field inflation the initial-value-dependence is strongly suppressed thanks to a river-valley like potential. The model predicts the tensor-to-scalar ratio r of cosmological perturbations smaller than that of the R² inflation, i.e., 0.0044 ≳ r ≳ 0.0017 for e-foldings between 50 and 60: the model will be consistent even with a null detection at LiteBird/CMB-S4. We find that the non-Gaussianity parameter fNL is O(10⁻²), the same size as that of single-field inflation. The dark matter particles are the lightest Nambu-Goldstone bosons associated with chiral symmetry breaking, which are decay products of one of the inflatons and are heavier than 10⁹ GeV with a strongly suppressed coupling with the standard model, implying that the dark matter will be unobservable in direct as well as indirect measurements.