Computation of the Power Spectrum in Chaotic $1/4 λφ^4$ Inflation

Details Computation of the Power Spectrum in Chaotic $1/4 λφ^4$ Inflation Computation of the Power Spectrum in Chaotic $1/4 λφ^4$ Inflation

2011-12-06

arxiv.org/abs/1112.1342v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Accepted in JCAP (15 pages, 5 figures). arXiv admin note: substantial text overlap with arXiv:0904.4295

Scientific paper

The phase-integral approximation devised by Fr\"oman and Fr\"oman, 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.

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