3 papers
hep-ph2026
Conventional and Unitarity-Conserving Peccei-Quinn Inflation Models and ACT
J. McDonald
We compare conventional non-minimally coupled Peccei-Quinn (PQ) inflation with a version of the model in which unitarity conservation is imposed by additional Jordan frame interact…
hep-ph2025
Higgs Inflation with Vector-Like Quark Stabilisation and the ACT spectral index
John McDonald
Recently, the Atacama Cosmology Telescope (ACT) collaboration has reported a scalar spectral index . This is substantially larger than the classical predic…
hep-ph2025
Vector-like Quark Stabilised Higgs Inflation: Implications for Particle Phenomenology, Primordial Gravitational Waves and the Hubble Tension
John McDonald
The Standard Model (SM) Higgs potential is likely to be metastable, in which case Higgs Inflation requires an extension of the SM to sufficiently stabilise the Higgs potential. Her…