Computation of inflationary cosmological perturbations in chaotic inflationary scenarios using the phase-integral method

Journal Article · Fri May 15 00:00:00 EDT 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.79.103502· OSTI ID:21296307

Rojas, Clara ^[1]; Villalba, Victor M ^[2]

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1. Departamento de Fisica, Aplicada IVIC/Merida, Merida 5107 (Venezuela, Bolivarian Republic of)
2. Centro de Fisica IVIC Apdo 21827, Caracas 1020A (Venezuela, Bolivarian Republic of)

The phase-integral approximation devised by Froeman and Froeman is used for computing cosmological perturbations in the quadratic chaotic inflationary model. The phase-integral formulas for the scalar and tensor power spectra are explicitly obtained up to fifth order of the phase-integral approximation. We show that the phase integral gives a very good approximation for the shape of the power spectra associated with scalar and tensor perturbations as well as the spectral indices. We find 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.

• OSTI ID: 21296307
• Journal Information: Physical Review. D, Particles Fields, Vol. 79, Issue 10; Other Information: DOI: 10.1103/PhysRevD.79.103502; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
APPROXIMATIONS
CHAOS THEORY
COMPARATIVE EVALUATIONS
COSMOLOGICAL MODELS
DISTURBANCES
PERTURBATION THEORY
SPECTRA