Inhomogeneous preinflation across Hubble scales in full general relativity

We use the 3+1 formalism of numerical relativity to investigate robustness Starobinsky and Higgs inflation inhomogeneous initial conditions, in form either field gradient or kinetic energy density. Sub-Hubble Hubble-sized fluctuations generically lead after an oscillatory phase between energies. inhomogeneities also produce contracting regions that may end up forming primordial black holes, subsequently diluted by inflation. analyse dynamics preinflation era generation vector tensor fluctuations. Our analysis further supports any size inhomogeneity, field, velocity equation state. At large values, only marginally depends on potential it is expected such behaviour universal applies plateau-type, favoured CMB observations Planck.