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Orfeu Bertolami, Vítor Bessa, and Jorge Páramos (2016)

Inflation with a massive vector field nonminimally coupled to gravity

We study the possibility that inflation is driven by a massive vector field with SO(3) global symmetry nonminimally coupled to gravity. From an E3-invariant Robertson-Walker metric we propose an Ansatz for the vector field, allowing us to study the evolution of the system. We study the behavior of the equations of motion using the methods of the theory of dynamical systems and find exponential inflationary regimes.