Stability of curvature perturbation with new covariant form for energy-momentum transfer in dark sector

Details Stability of curvature perturbation with new covariant form for energy-momentum transfer in dark sector Stability of curvature perturbation with new covariant form for energy-momentum transfer in dark sector

2011-10-09

arxiv.org/abs/1110.1807v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

12 pages, 2 figures

Scientific paper

It was found that the model with interaction between cold dark matter (CDM) and dark energy (DE) proportional to the energy density of CDM $\rho_m$ and constant equation of state of DE $w_d$ 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 $w_d$ and interaction proportional to $\rho_m$. Furthermore, we analyze the dominant non-adiabatic mode in the radiation era and find that the mode grows regularly.

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