Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/32688
Título: | Covariant and gauge-invariant linear scalar perturbations in multiple scalar field cosmologies |
Autor(es): | Alho, Artur Mena, Filipe C. |
Data: | 2014 |
Editora: | American Physical Society |
Revista: | Physical 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). |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/32688 |
DOI: | 10.1103/PhysRevD.90.043501 |
ISSN: | 1550-2368 1550-7998 |
Versão da editora: | http://journals.aps.org/prd/abstract/10.1103/PhysRevD.90.043501 |
Arbitragem científica: | yes |
Acesso: | Acesso restrito UMinho |
Aparece nas coleções: | CMAT - Artigos em revistas com arbitragem / Papers in peer review journals |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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alho-mena-2014.pdf Acesso restrito! | 4,06 MB | Adobe PDF | Ver/Abrir |