Sommerfeld Enhancement from Unparticle Exchange for Dark Matter Annihilation

Understand

We investigate the implication of unparticle exchange for the possible Sommerfeld enhancement in dark matter annihilation process.

• Assuming the unparticle exchange during WIMP collision, we solve the Schr\rm\ddot{o}dinger equation for the effective potential, and find that the Sommerfeld enhancement factor is dictated by the scale dimension of unparticle as 1/v^{3-2d_{\UP}}.
• Numerically the Sommerfeld enhancement could be {\cal O}(10-10^{3}).