Computation of inflationary cosmological perturbations in the power-law inflationary model using the phase-integral method
Computation of inflationary cosmological perturbations in the power-law inflationary model using the phase-integral method
The phase-integral approximation devised by Fr\"oman and Fr\"oman, is used for computing cosmological perturbations in the power-law inflationary model. The phase-integral formulas for the scalar and tensor power spectra are explicitly obtained up to ninth-order of the phase-integral approximation. We show that, the phase-integral approximation exactly reproduces the shape of …