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.

UR - http://www.scopus.com/inward/record.url?scp=29144496934&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=29144496934&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2005.10.065

DO - 10.1016/j.physletb.2005.10.065

M3 - Article

AN - SCOPUS:29144496934

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

SN - 0370-2693

IS - 2-3

ER -