Stability of curvature perturbation with new covariant form for energy-momentum transfer in dark sector
arXiv:1110.1807 · doi:10.1140/epjc/s10052-013-2331-z
Abstract
It was found that the model with interaction between cold dark matter (CDM) and dark energy (DE) proportional to the energy density of CDM and constant equation of state of DE suffered from instabilities of the density perturbations on the supper-Hubble scales. Here we suggest a new covariant model for the energy-momentum transfer between CDM and DE. Then using the covariant model, we analyze the evolution of density perturbations on the supper-Hubble scale. We find that the instabilities can be avoided in the model with constant and interaction proportional to . Furthermore, we analyze the dominant non-adiabatic mode in the radiation era and find that the mode grows regularly.
12 pages, 2 figures
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