引力暗物质衰变和ATIC/PPB-BETS过剩
Gravitational Dark Matter Decay and the ATIC/PPB-BETS Excess
摘要：
隐藏的标量场，只通过普朗克抑制的相互作用耦合到可见部分，是暗物质的候选者，因为它的寿命很长。这种标量场的衰变为这种情况提供了观测检验。我们发现，隐藏的标量场的衰减可以解释所观察到的过量的高能正电子/电子观察到的ATIC/PPB-BETS，为适当的选择的质量和真空期望值的字段。我们还表明，相同的参数选择给出了观测到的暗物质丰度。这种惊人的巧合表明，普朗克抑制的相互作用可能是观测到的宇宙射线正电子/电子过剩的原因。
英文摘要：
The hidden scalar field, which couples to the visible sector only through Planck-suppressed interactions, is a candidate for dark matter owing to its long lifetime. Decay of such a scalar field offers observational tests of this scenario. We show that decay of the hidden scalar field can explain the observed excess of high-energy positrons/electrons observed by ATIC/PPB-BETS, for a suitable choice of the mass and the vacuum expectation value of the field. We also show that the same choice of the parameters gives the observed dark matter abundance. Such a remarkable coincidence suggests that the Planck-suppressed interactions may be responsible for the observed excess in the cosmic-ray positrons/electrons.
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