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Linear and non-Linear Instabilities in Unified Dark Energy Models

P. P. Avelino, L. M. G. BeÁa, C. J. A. P. Martins

Abstract
We revisit the paradigm of unified dark energy discussing in detail the averaging problem in this type of scenarios, highlighting the need for a full non-linear treatment. We also address the question of if and how models with one or several dark fluids can be observationally distinguished. Simpler and physically clearer derivations of some key results, most notably on the relation between the generalized Chaplygin gas and the standard (ΔCDM) ‘concordance’ model and on a Jeans-type small-scale instability of some coupled dark energy/dark matter models are presented.

Physical Review D
Volume 77, Page 063515.1
2008 May

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Instituto de Astrof√≠sica e Ci√™ncias do Espa√ßo Universidade do Porto Faculdade de Ciências da Universidade de Lisboa
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia