| Issue |
EPL
Volume 82, Number 6, June 2008
|
|
|---|---|---|
| Article Number | 69001 | |
| Number of page(s) | 4 | |
| Section | Geophysics, Astronomy and Astrophysics | |
| DOI | https://doi.org/10.1209/0295-5075/82/69001 | |
| Published online | 04 June 2008 | |
Instability of scalar perturbations in a phantomic cosmological scenario
1
Institut d'Astrophysique de Paris - 98bis, Boulevard Arago, 75014 Paris, France, EU
2
Departamento de Física, Universidade Federal do Espírito Santo - 29060-900, Vitória, Espírito Santo, Brazil
Corresponding authors: fabris@pq.cnpq.br dfarago@bol.com.br sergio.vitorino@pq.cnpq.br
Received:
3
December
2007
Accepted:
24
April
2008
Scalar perturbations can grow during a phantomic cosmological phase as the big rip is approached, in spite of the highly accelerated expansion regime, if the equation of state is such that 
= w < - 
. It is shown that such result is independent of the spatial curvature. The perturbed equations are exactly solved for any value of the curvature parameter k and of the equation of state parameter w. Growing modes are found asymptotically under the condition 
. Since the Hubble radius decreases in a phantom universe, such result indicates that a phantom scenario may not survive longtime due to gravitational instability.
PACS: 98.80.-k – Cosmology / 95.36.+x – Dark energy
© EPLA, 2008
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