Computation of inflationary cosmological perturbations in the power-law inflationary model using the phase-integral method

Journal Article · Thu Mar 15 00:00:00 EDT 2007 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.75.063518· OSTI ID:21020142

Rojas, Clara; Villalba, Victor M ^[1]

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1. Centro de Fisica IVIC Apdo 21827, Caracas 1020A (Venezuela)

The phase-integral approximation devised by Froeman and Froeman, 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 the power spectra for scalar and tensor perturbations as well as the spectral indices. We compare the accuracy of the phase-integral approximation with the results for the power spectrum obtained with the slow-roll and uniform-approximation methods.

• OSTI ID: 21020142
• Journal Information: Physical Review. D, Particles Fields, Vol. 75, Issue 6; Other Information: DOI: 10.1103/PhysRevD.75.063518; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCURACY
APPROXIMATIONS
COMPARATIVE EVALUATIONS
COSMOLOGY
ENERGY SPECTRA
INFLATIONARY UNIVERSE
SCALARS
TENSORS