Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2005-10-24
Phys.Rev. D72 (2005) 103516
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
REVTeX 4, 13 pages, no figures, final version to appear in Phys. Rev. D
Scientific paper
10.1103/PhysRevD.72.103516
We extend the WKB method for the computation of cosmological perturbations during inflation beyond leading order and provide the power spectra of scalar and tensor perturbations to second order in the slow-roll parameters. Our method does not require that the slow-roll parameters be constant. Although leading and next-to-leading results in the slow-roll parameters depend on the approximation technique used in the computation, we find that the inflationary theoretical predictions obtained may reach the accuracy required by planned observations. In two technical appendices, we compare our techniques and results with previous findings.
Casadio Roberto
Finelli Fabio
Luzzi Mattia
Venturi Giovanni
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