Inflationary dynamics with runaway potentials

Abstract

)is studied. Considering different values of the parameters α, β and m, we derive several newinflationary solutions in which one fields just evolves in the background and is not important forthe inflationary dynamics. In addition, we find new solutions where both fields are dynamicallyimportant during inflation. Moreover, we discuss the evolution of perturbations in both scalar fieldsand the spacetime metric, concentrating on the production of entropy perturbations. We find thatfor a large region in parameter space and initial conditions tensor modes are negligible and thatadiabatic and isocurvature perturbations are essentially uncorrelated.