Dynamically Induced Topological Inflation

TL;DR

This paper introduces a novel topological inflation model driven by strong dynamics in an $Sp(2)$ gauge theory, achieving consistency with CMB data without fine-tuning and predicting a hierarchy of fundamental energy scales.

Contribution

It presents a new inflationary scenario based on $Sp(2)$ gauge dynamics with a super-Planckian global minimum, avoiding initial condition problems and fine-tuning.

Findings

Model consistent with CMB observations.

Predicts a hierarchy of energy scales.

No fine-tuning required for parameters.

Abstract

We propose an inflation model in which the inflationary era is driven by the strong dynamics of $Sp(2)$ gauge theory. The quark condensation in the confined phase of $Sp(2)$ gauge theory generates the inflaton potential comparable to the energy of the thermal bath at the time of phase transition. Afterwards, with super-Planckian global minimum, the inflation commences at a false vacuum region lying between true vacuum regions and hence the name "topological inflation". Featured by the huge separation between the scale of the false vacuum ($V(0)^{1/4}\sim10^{15}{\rm GeV}$) and the global minimum ($\langle\phi\rangle\sim M_{P}$), the model can be consistent with CMB observables without suffering from the initial condition problem. Crucially, this is achieved without any fine-tuning of parameters in $V(\phi)$. In addition to $Sp(2)$, this model is based on an anomaly free $Z_{6R}$ discrete $R$ symmetry. Remarkably, while all parameters are fixed by CMB observations, the model predicts a hierarchy of energy scales including the inflation scale, SUSY-breaking scale, R-symmetry breaking scale, Higgsino mass and the right-handed neutrino mass given in terms of the dynamical scale of $Sp(2)$.