# Voids and overdensities of coupled Dark Energy

@article{Mainini2009VoidsAO, title={Voids and overdensities of coupled Dark Energy}, author={Roberto Mainini}, journal={Journal of Cosmology and Astroparticle Physics}, year={2009}, volume={2009}, pages={017-017} }

We investigate the clustering properties of dynamical Dark Energy even in association of a possible coupling between Dark Energy and Dark Matter. We find that within matter inhomogeneities, Dark Energy migth form voids as well as overdensity depending on how its background energy density evolves. Consequently and contrarily to what expected, Dark Energy fluctuations are found to be slightly suppressed if a coupling with Dark Matter is permitted. When considering density contrasts and scales…

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## References

SHOWING 1-10 OF 96 REFERENCES

On the Magnitude of Dark Energy Voids and Overdensities

- Physics
- 2008

We investigate the clustering of dark energy within matter overdensities and voids. In particular, we derive an analytical expression for the dark energy density perturbations, which is valid in the…

Voids of dark energy

- Physics
- 2007

We investigate the clustering properties of a dynamical dark energy component. In a cosmic mix of a pressureless fluid and a light scalar field, we follow the linear evolution of spherical matter…

Cluster number counts dependence on dark energy inhomogeneities and coupling to dark matter

- Physics, Environmental Science
- 2005

Cluster number counts can be used to test dark energy models. We investigate dark energy candidates which are coupled to dark matter. We analyse the cluster number counts dependence on the amount of…

Structure formation in inhomogeneous dark energy models

- Physics
- 2006

We investigate how inhomogeneous quintessence models may have a specific signature even in the linear regime of large-scale structure formation. The dynamics of the collapse of a dark matter halo is…

Dark energy and the evolution of spherical overdensities

- Physics
- 2004

We use the non-linear spherical model in cold dark matter (CDM) cosmologies with dark energy to investigate the effects of dark energy on the growth of structure and the formation of virialized…

Matter density perturbations in interacting quintessence models

- Physics
- 2006

Models with dark energy decaying into dark matter have been proposed to solve the coincidence problem in cosmology. We study the effect of such coupling in the matter power spectrum. Because of the…

On virialization with dark energy

- Physics
- 2005

We review the inclusion of dark energy in the formalism of spherical collapse, and the virialization of a two-component system, made of matter and dark energy. We compare two approaches in previous…

Modeling Dynamical Dark Energy

- Physics
- 2003

Cosmological models with different types of dark energy are becoming viable alternatives for standard models with the cosmological constant, yet such models are more difficult to analyze and to…

Number counts in homogeneous and inhomogeneous dark energy models

- Physics
- 2006

In the simple case of a constant equation of state, redshift distribution of collapsed structures may constrain dark energy models. Different dark energy models having the same energy density today…

Numerical study of halo concentrations in dark-energy cosmologies

- Physics
- 2004

We study the concentration parameters, their mass dependence and redshift evolution, of dark-matter halos in different dark-energy cosmologies with constant and time-variable equation of state, and…