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- W3100812093 abstract "We examine the evolution of an inhomogeneous mixture of non-relativistic pressureless cold dark matter (CDM), coupled to dark energy (DE) characterised by the equation of state parameter $w<-1/3$, with the interaction term proportional to the DE density. This coupled mixture is the source of a spherically symmetric Lema^ itre-Tolman-Bondi (LTB) metric admitting an asymptotic Friedman-Lema^ itre-Robertson-Walker (FLRW) background. Einstein's equations reduce to a 5-dimensional autonomous dynamical system involving quasi--local variables related to suitable averages of covariant scalars and their fluctuations. The phase space evolution around the critical points (past/future attractors and five saddles) is examined in detail. For all parameter values and both directions of energy flow (CDM to DE and DE to CDM) the phase space trajectories are compatible with a physically plausible early cosmic times behaviour near the past attractor. This result compares favourably with mixtures with the interaction driven by the CDM density in which conditions for a physically plausible past evolution are more restrictive. Numerical examples are provided describing the evolution of an initial profile that can be associated with idealised structure formation scenarios" @default.
- W3100812093 created "2020-11-23" @default.
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- W3100812093 date "2018-03-01" @default.
- W3100812093 modified "2023-10-02" @default.
- W3100812093 title "Interactive mixture of inhomogeneous dark fluids driven by dark energy: a dynamical system analysis" @default.
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- W3100812093 doi "https://doi.org/10.1140/epjc/s10052-018-5699-y" @default.
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