The Standard Model extended by n vector-like quarks and one right-handed neutrino stabilizes the Higgs quartic to the Planck scale, produces viable neutrino masses via Type-I seesaw, and yields inflationary observables n_s and r consistent with Planck and ACT data.
The point at which a given trajectory intersects the lineλ min = 0 signals the onset of vacuum instability for the corresponding (n, M D)
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Neutrino Mass, Vacuum Stability and Higgs Inflation with Vector-Like Quarks and a Single Right-Handed Neutrino
The Standard Model extended by n vector-like quarks and one right-handed neutrino stabilizes the Higgs quartic to the Planck scale, produces viable neutrino masses via Type-I seesaw, and yields inflationary observables n_s and r consistent with Planck and ACT data.