https://doi.org/10.1140/epjc/s10052-009-0873-x
Regular Article - Theoretical Physics
A confirmation of agreement of different approaches for scalar gauge-invariant metric perturbations during inflation
1
Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, Funes 3350, 7600, Mar del Plata, Argentina
2
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
* e-mail: mbellini@mdp.edu.ar
Received:
30
September
2008
Revised:
16
December
2008
Published online:
6
February
2009
We revisit an extension of the well-known formalism for gauge-invariant scalar metric fluctuations to study the spectra for both the inflaton and gauge-invariant (scalar) metric fluctuations in the framework of a single-field inflationary model, in which the quasi-exponential expansion is driven by an inflaton which is minimally coupled to gravity. The proposal here examined is valid also for fluctuations with large amplitudes, but for cosmological scales, where vector and tensor perturbations can be neglected and the fluid is irrotacional.
© Springer-Verlag , 2009
