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Parametrized Post-Friedmann Framework for Interacting Dark Energy by Li, Yun-He; Zhang, Jing-Fei; Zhang, Xin is a scholarly article available to read on EtoBox.

What is Parametrized Post-Friedmann Framework for Interacting Dark Energy about?

Dark energy might directly interact with cold dark matter. However, in such a scenario, an early-time large-scale instability occurs occasionally, which may be due to the incorrect treatment for the pressure perturbation of dark energy as a nonadiabatic fluid. To avoid this nonphysical instability, we establish a new framework to correctly calculate the cosmological perturbations in the interacting dark energy models. Inspired by the well-known parametrized post-Friedmann approach, the condition of the dark energy pressure perturbation is replaced with the relationship between the momentum density of dark energy and that of other components on large scales. By reconciling the perturbation evolutions on the large and small scales, one can complete the perturbation equations system. The large-scale instability can be successfully avoided and the well-behaved density and metric perturbations are obtained within this framework. Our test results show that this new framework works very well and is applicable to all the interacting dark energy models.

Author

Li, Yun-He; Zhang, Jing-Fei; Zhang, Xin

Published

2014

Language

EN