Unparticle effects in supernovae cooling

Recently H. Georgi suggested that a scale-invariant unparticle U sector with an infrared fixed point at high energy can couple with the standard model matter via a higher-dimensional operator suppressed by a high cutoff scale. Intense phenomenological search of this unparticle sector in the collider and flavor physics context has already been made. Here we explore its impact in cosmology, particularly its possible role in the supernovae cooling. We found that the energy-loss rate (and thus the cooling) is strongly dependent on the effective scale Λ_U and the anomalous dimension d_U of this unparticle theory.