1306.1910 (Chao-Qiang Geng et al.)

Dark radiation from a unified dark fluid model    [PDF]

Chao-Qiang Geng, Lu-Hsing Tsai, Xin Zhang

We present a unified dark fluid model to describe the possible evolutionary behavior of $\Delta N_\mathrm{eff}$ in dark radiation. This model can be viewed as an interacting model for the dark sectors, in which dark matter interacts with dark radiation. We show that the evolution of $\Delta N_\mathrm{eff}$ can be nicely explained without some drawbacks, such as the blowup of $\Delta N_\mathrm{eff}$ at the late time and the interaction term at the early time.

View original: http://arxiv.org/abs/1306.1910