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

We consider the dark matter scalar in the Randall-Sundrum background and study the annihilation cross section if 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 considerable enhancement of the annihilation cross section. Furthermore, we take the unparticle, having a nonzero mass coming from the standard model Higgs-unparticle interaction at low energy levels, as a dark matter candidate and analyze the annihilation cross section by including the effect of 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. (author)