Beginning inflation in conformally curved spacetimes

We investigate the initiation of cosmic inflation, in full numerical relativity, from preinflationary scenarios with large tensor and vector fluctuations in the metric. These settings are characterized by having large values in the Weyl curvature tensor. In the matter sector, we consider a single scalar field with inhomogeneous field velocities, corresponding to a kination period. In the context of large-field inflation, it is shown that the onset of inflation continues to be robust to this type of initial conditions, and that during inflation the Universe successfully homogenizes and flattens any type of curvature, leading to a Friedmann-Lemaitre-Robertson-Walker Universe after just a few tens of e-folds of accelerating expansion.