具有Z_2对称性的左右对称模型的暗物质约束
The Dark Matter Constraints on the Left-Right Symmetric Model with Z_2 Symmetry
摘要：
在左右对称模型的框架下，我们研究了一个有趣的场景，即所谓的VEV跷跷板问题可以自然地用Z_2对称性来解决。在这种情况下，我们发现了一对稳定的弱相互作用大质量粒子（WIMP），这可能是冷暗物质的候选者。然而，从$m \sim 10^2-10^4 $ GeV的直接暗物质探测实验中，WIMP-核子截面比目前的上限高3-5个数量级。结果，两个稳定粒子的残留数密度必须被强烈地抑制到非常小的水平。然而，我们的分析表明，这种情况下不能提供非常大的湮灭截面，以提供所需的遗物丰度，除了共振的情况下。只有当盘状星系的自转曲线可以用修正的牛顿动力学（MOND）解释时，稳定的WIMP才有可能成为冷暗物质的候选者。
英文摘要：
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. Nevertheless, our analysis shows that this scenario can't provide very large annihilation cross sections so as to give the desired relic abundance except for the resonance case. Only for the case if the rotation curves of disk galaxies are explained by the Modified Newtonian Dynamics (MOND), the stable WIMPs could be as the candidates of cold dark matter.
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