Slow-roll inflation from massive vector fields non-minimally coupled to gravity

Understand

In this work we study slow-roll inflation for a vector-tensor model with massive vector fields non-minimally coupled to gravity.

• The model under consideration has arbitrary parameters for each geometrical coupling.
• Taking into account a spatially flat FRW type universe and a general vector fields (with temporal and spatial components), we get the general expressions for equation of motion and the total energy momentum tensor.
• In this scenario, the isotropy of expansion is guaranteed considering a triplet of orthogonal vector fields, but the effective mass of the vector field is of the order of the Hubble scale and the inflationary regime is difficult to realize with this model.