TY - JOUR
T1 - Phantom damping of matter perturbations
AU - Amendola, Luca
AU - Tsujikawa, Shinji
AU - Sami, M.
N1 - Funding Information:
The work of S.T. is supported by JSPS (No. 30318802). M.S. thanks Jamia Millia for hospitality during the period of his leave from the university.
PY - 2006/1/12
Y1 - 2006/1/12
N2 - 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.
AB - 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.
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U2 - 10.1016/j.physletb.2005.10.065
DO - 10.1016/j.physletb.2005.10.065
M3 - Article
AN - SCOPUS:29144496934
SN - 0370-2693
VL - 632
SP - 155
EP - 158
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 2-3
ER -