Extending Higgs Inflation with TeV Scale New Physics

TL;DR

This paper proposes a minimal extension to Higgs inflation by adding TeV-scale singlet particles, which broadens the tensor-to-scalar ratio range and aligns with experimental data, while also fitting collider measurements.

Contribution

The work introduces a simple TeV-scale extension to Higgs inflation that modifies the tensor-to-scalar ratio and fits collider data, addressing previous tuning issues.

Findings

Broader tensor-to-scalar ratio range $r=O(0.1 - 10^{-3})$ compatible with BICEP2 and Planck.

Higgs and top masses fit current collider measurements.

Implications for detecting new particles at the LHC and future colliders.

Abstract

Higgs inflation is among the most economical and predictive inflation models, although the original Higgs inflation requires tuning the Higgs or top mass away from its current experimental value by more than $2\sigma$ deviations, and generally gives a negligible tensor-to-scalar ratio $r \sim 10^{-3}$ (if away from the vicinity of critical point). In this work, we construct a minimal extension of Higgs inflation, by adding only two new weak-singlet particles at TeV scale, a vector-quark $T$ and a real scalar $S$. The presence of singlets $(T, S)$ significantly impact the renormalization group running of the Higgs boson self-coupling. With this, our model provides a wider range of the tensor-to-scalar ratio $r = O(0.1 - 10^{-3})$, consistent with the favored $r$ values by either BICEP2 or Planck data, while keeping the successful prediction of the spectral index $ n_s \simeq 0.96 $. It further allows the Higgs and top masses to fully fit the collider measurements. We also discuss implications for searching the predicted TeV-scale vector-quark $T$ and scalar $S$ at the LHC and future high energy pp colliders.