Scalar field-perfect fluid correspondence and nonlinear perturbation equations
arXiv:0806.0516 · doi:10.1088/1475-7516/2008/07/003
Abstract
The properties of dynamical Dark Energy (DE) and, in particular, the possibility that it can form or contribute to stable inhomogeneities, have been widely debated in recent literature, also in association to a possible coupling between DE and Dark Matter (DM). In order to clarify this issue, in this paper we present a general framework for the study of the nonlinear phases of structure formation, showing the equivalence between two possible descriptions of DE: a scalar field ϕself-interacting through a potential V(ϕ) and a perfect fluid with an assigned negative equation of state w(a). This enables us to show that, in the presence of coupling, the mass of DE quanta may increase where large DM condensations are present, so that also DE may partake to the clustering process.
16 pages, accepted for publication in JCAP
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- Constraint on Coupled Dark Energy Models from Observations
- Physical approximations for the nonlinear evolution of perturbations in dark energy scenarios
- Cosmological Perturbations in Models of Coupled Dark Energy
- Understanding the origin of CMB constraints on Dark Energy
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- Simulation studies of dark energy clustering induced by the formation of dark matter halos
- Correspondences of matter fluctuations in semiclassical and classical gravity for cosmological spacetime-II
- Correspondences between scalar field and fluid fluctuations in curved spacetime