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Computation of the power spectrum in chaotic ¼λϕ4inflation
Journal of Cosmology and Astroparticle Physics
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.doi:10.1088/1475-7516/2012/01/003 fatcat:2okdhttl6rd33cgk2ehqq7w2u4