A classically conformal U(1)$^\prime$ extended Standard Model (SM)
is a simple and well-motivated extension of the SM,
where a new anomaly free U(1)$^\prime$ gauge symmetry is introduced
along with a U(1)$^\prime$ Higgs field $\Phi$ and three right-handed neutrinos.
In this model, the U(1)$^\prime$ gauge symmetry is broken
by the Coleman-Weinberg mechanism naturally at the TeV scale,
which subsequently triggers the electroweak symmetry breaking.
In this context, we consider quartic inflation with non-minimal gravitational coupling,
where the U(1)$^\prime$ Higgs field $\Phi$ is identified with inflation.
Through the Coleman-Weinberg mechanism, the quartic coupling of $\Phi$
has a relation with the U(1)$^\prime$ gauge coupling and the Majorana Yukawa couplings
of the right-handed neutrinos, and as a result
the inflationary predictions correlate with the gauge coupling and the Majorana Yukawa couplings.
Combining the constraints from the electroweak vacuum stability,
the search result for a U(1)$^\prime$ boson resonance at the LHC Run-2 and the Planck 2015 results,
we identify a phenomenologically viable parameter space.
|Parallel Session||Cosmology and Gravitational Waves|