Apparent exponential growth of metric perturbations in the Newtonian gauge for quadratic-gravity inflation is gauge-dependent and non-generic; other gauges remain well-behaved.
Starobinsky,Spectrum of relict gravitational radiation and the early state of the universe, JETP Lett.30(1979) 682
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Gauge-independent approach to inflation in quadratic gravity
Apparent exponential growth of metric perturbations in the Newtonian gauge for quadratic-gravity inflation is gauge-dependent and non-generic; other gauges remain well-behaved.
- Intertwined Constraints in Extended Cosmologies: Dark Energy, Curvature, Neutrinos, and Inflation