A confirmation of agreement of different approaches for scalar gauge-invariant metric perturbations during inflation

Details A confirmation of agreement of different approaches for scalar gauge-invariant metric perturbations during inflation A confirmation of agreement of different approaches for scalar gauge-invariant metric perturbations during inflation

2008-09-30

arxiv.org/abs/0809.5280v3

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Version accepted in EPJC with new title. 11 pages, no figures

Scientific paper

10.1140/epjc/s10052-009-0873-x

We revisit an extension of the well-known formalism for gauge-invariant scalar metric fluctuations, to study the spectrums for both, the inflaton and gauge invariant (scalar) metric fluctuations in the framework of a single field inflationary model where the quasi-exponential expansion is driven by an inflation which is minimally coupled to gravity. The proposal here examined is valid also for fluctuations with large amplitude, but for cosmological scales, where vector and tensor perturbations can be neglected and the fluid is irrotacional.

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