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Abstract: We analyze the behavior of linear perturbations in vector inflation. Incontrast to the scalar field inflation, the linearized theory with vectorfields contains couplings between scalar, vector and tensor modes. Theperturbations decouple only in the ultraviolet limit, which allows us to carryout the canonical quantization. Superhorizon perturbations can be approximatelyanalyzed due to suppressed mixing between different modes in the small fieldsmodels. We find that the vector perturbations of the metric decayexponentially, but the scalar and tensor modes could remain weakly coupledthroughout the evolution. As a result, the vector inflation can producesignificant correlations of the scalar and tensor modes in the CMB. For therealistic models the effect is rather small, but not negligible.



Author: Alexey Golovnev, Vitaly Vanchurin

Source: https://arxiv.org/







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