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Phys. Rev. D 77, 063515 (2008) [6 pages]

Linear and nonlinear instabilities in unified dark energy models

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P. P. Avelino1,2,*, L. M. G. Beça1,2,†, and C. J. A. P. Martins1,3,4,‡
1Centro de Física do Porto, Rua do Campo Alegre 687, 4169-007 Porto, Portugal
2Departamento de Física da Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre 687, 4169-007 Porto, Portugal
3Centro de Astrofísica, Universidade do Porto, Rua das Estrelas s/n, 4150-762 Porto, Portugal
4Department of Applied Mathematics and Theoretical Physics, Centre for Mathematical Sciences, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA, United Kingdom

Received 28 November 2007; published 12 March 2008

We revisit the paradigm of unified dark energy discussing in detail the averaging problem in this type of scenario, highlighting the need for a full nonlinear 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 (ΛCDM) “concordance” model and on a Jeans-type small-scale instability of some coupled dark energy/dark matter models are presented.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.77.063515
DOI:
10.1103/PhysRevD.77.063515
PACS:
98.80.Cq, 95.35.+d, 98.80.Es

*ppavelin@fc.up.pt

†luis.beca@fc.up.pt

‡C.J.A.P.Martins@damtp.cam.ac.uk

 
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