Phantom damping of matter perturbations

Luca Amendola, Shinji Tsujikawa*, M. Sami

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

98 Citations (Scopus)


Cosmological scaling solutions are particularly important in solving the coincidence problem of dark energy. We derive the equations of sub-Hubble linear matter perturbations for a general scalar-field Lagrangian - including quintessence, tachyon, dilatonic ghost condensate and k-essence - and solve them analytically for scaling solutions. We find that matter perturbations are always damped if a phantom field is coupled to dark matter and identify the cases in which the gravitational potential is constant. This provides an interesting possibility to place stringent observational constraints on scaling dark energy models.

Original languageEnglish
Pages (from-to)155-158
Number of pages4
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number2-3
Publication statusPublished - 2006 Jan 12
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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