The Dark Matter Constraints on the Left-Right Symmetric Model with Z_2 Symmetry

Understand

In the framework of Left-Right symmetric model, we investigate an interesting scenario, in which the so-called VEV seesaw problem can be naturally solved with Z_2 symmetry.

• In such a scenario, we find a pair of stable weakly interacting massive particles (WIMPs), which may be the cold dark matter candidates.
• However, the WIMP-nucleon cross section is 3-5 orders of magnitude above the present upper bounds from the direct dark matter detection experiments for $m \sim 10^2-10^4 $ GeV.
• As a result, the relic number density of two stable particles has to be strongly suppressed to a very small level.