RT journal article
T1 Kinetic dominance and psi series in the Hamilton-Jacobi formulation of inflaton models
A1 Medina Reus, Elena Blanca
A1 Martínez Alonso, Luis
A2 Matemáticas
AB Single-field inflaton models in the kinetic dominance period admit formal solutions given by generalizedasymptotic expansions called psi series. We present a method for computing psi series for the Hubbleparameter as a function of the inflaton field in the Hamilton-Jacobi formulation of inflaton models. Similar psi series for the scale factor, the conformal time, and the Hubble radius are also derived. They are applied to determine the value of the inflaton field when the inflation period starts and to estimate the contribution of the kinetic dominance period to calculate the duration of inflation. These psi series are also used to obtain explicit two-term truncated psi series near the singularity for the potentials of the Mukhanov-Sasaki equation for curvature and tensor perturbations. The method is illustrated with wide families of inflaton models determined by potential functions combining polynomial and exponential functions, as well as with generalized Starobinsky models.
SN 1550-2368
YR 2020
FD 2020
LK http://hdl.handle.net/10498/26626
UL http://hdl.handle.net/10498/26626
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 10-may-2026