English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Inflationary observables of a classically scale invariant model, in which theorigin of the Planck mass and the electroweak scale including the right-handedneutrino mass is chiral symmetry breaking in a QCD-like hidden sector, arestudied. Despite a three-field inflation the initial-value-dependence isstrongly suppressed thanks to a river-valley like potential. The model predictsthe tensor-to-scalar ratio $r$ of cosmological perturbations smaller than thatof the $R^2$ inflation, i.e., $ 0.0044 \gsim r \gsim 0.0017$ for e-foldingsbetween $50$ and $60$: The model will be consistent even with a null detectionat LiteBird/CMB-S4. We find that the non-Gaussianity parameter $f_{NL}$ is$O(10^{-2})$, the same size as that of single-field inflation. The dark matterparticles are the lightest Nambu-Goldstone bosons associated with chiralsymmetry breaking, which are decay products of one of the inflatons and areheavier than $10^9$ GeV with a strongly suppressed coupling with the standardmodel, implying that the dark matter will be unobservable in direct as well asindirect measurements.

Scale Invariant Extension of the Standard Model: A Nightmare Scenario in Cosmology