Sub-horizon Perturbation Behavior in Extended Quintessence

Details Sub-horizon Perturbation Behavior in Extended Quintessence Sub-horizon Perturbation Behavior in Extended Quintessence

2002-05-15

arxiv.org/abs/astro-ph/0205245v1

Astronomy and Astrophysics

Astrophysics

Proceedings of the 5th International UCLA Symposium on Sources and Detection of Dark Matter and Dark Energy in the Universe (D

Scientific paper

10.1016/S0920-5632(03)02080-2

In the general context of scalar-tensor theories, we consider a model in which a scalar field coupled to the Ricci scalar in the gravitational sector of the Lagrangian, is also playing the role of an ``Extended Quintessence'' field, dominating the energy content of the Universe at the present time. In this framework, we study the linear evolution of the perturbations in the Quintessence energy density, showing that a new phenomenon, named here ``gravitational dragging'', can enhance the scalar field density perturbations as much as they reach the non-linear regime. The possibility of dark energy clumps formation is thus discussed.

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