The effect of the curvature-scalar mixing on the annihilation cross sections of dark matter scalar and unparticle dark matter

Abstract

We consider the dark matter scalar in the Randall Sundrum background and study the annihilation cross section if the curvature-scalar mixing is switched on. In this case, in addition to the radion, the standard model Higgs scalar drives the annihilation and it leads to a considerable enhancement in the annihilation cross section. Furthermore we take unparticle, having a non-zero mass coming from the standard model Higgs-unparticle interaction in the low energy level, as a dark matter candidate and analyze the annihilation cross section by including the effect of the curvature-scalar mixing. We see that, for both choices, the mixing process plays an essential role in obtaining the dark matter annihilation cross section in the current range.