Inflation with vector fields revisited: non-Gaussianities
The paper investigates how vector fields modify primordial perturbations during inflation by organizing dynamics using a parameter 'h', which compares vector kinetic contributions to scalar field kinetic contributions. For small h, vector fields cause cumulative non-Gaussianities constrained by CMB data. For large h, the resulting non-Gaussianities depend on the matching scale, leading to either local or flattened shapes and suggesting correlations between different wavelength modes.