Michael Welsh

Degeneracy of the Garriga–Mukhanov Perturbation Variables at Time-Symmetric Surfaces

This preprint identifies a domain-of-validity failure in the Garriga-Mukhanov perturbation variables for curved cosmological models at time-symmetric surfaces, where the Hubble rate and background field velocity both vanish.It derives a universal inverse-square divergence in the...

Degeneracy of the Garriga–Mukhanov Perturbation Variables at Time-Symmetric Surfaces

This preprint identifies a domain-of-validity failure in the Garriga-Mukhanov perturbation variables for curved cosmological models at time-symmetric surfaces, where the Hubble rate and background field velocity both vanish.It derives a universal inverse-square divergence in the...