Utilize este identificador para referenciar este registo: http://hdl.handle.net/1822/32688

TítuloCovariant and gauge-invariant linear scalar perturbations in multiple scalar field cosmologies
Autor(es)Alho, Artur
Mena, Filipe C.
EditoraAmerican Physical Society
RevistaPhysical Review D: Particles, Fields, Gravitation, and Cosmology
Resumo(s)We derive a set of equations monitoring the evolution of covariant and gauge-invariant linear scalar perturbations of Friedman-Lemaître-Robertson-Walker models with multiple interacting nonlinear scalar fields. We use a dynamical systems' approach in order to perform a stability analysis for some classes of scalar field potentials. In particular, using a recent approximation for the inflationary dynamics of the background solution, we derive conditions under which homogenization occurs for chaotic (quadratic and quartic potentials) and new inflation. We also prove a cosmic no-hair result for power-law inflation and its generalisation for two scalar fields with independent exponential potentials (assisted power-law inflation).
Versão da editorahttp://journals.aps.org/prd/abstract/10.1103/PhysRevD.90.043501
Arbitragem científicayes
Aparece nas coleções:CMAT - Artigos com arbitragem/Papers with refereeing

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