2011/12/06 by Clara Rojas, Victor M. Villalba
Physics and Astronomy · #astro-ph.CO
paper · pdf · doi:10.1088/1475-7516/2012/01/003
Accepted in JCAP (15 pages, 5 figures). arXiv admin note: substantial text overlap with arXiv:0904.4295
arxiv created 2011/12/06 · arxiv updated 2015/06/03
The phase-integral approximation devised by Fröman and Fröman, is used for computing cosmological perturbations in the quartic chaotic inflationary model. The phase-integral formulas for the scalar power spectrum are explicitly obtained up to fifth order of the phase-integral approximation. As in previous reports [1-3], we point out that the accuracy of the phase-integral approximation compares favorably with the numerical results and those obtained using the slow-roll and uniform approximation methods.