破坏Dine-Fischler-Srednicki-Zhitnitsky轴子模型的超对称R宇称
The Supersymmetric R-Parity Violating Dine-Fischler-Srednicki-Zhitnitsky Axion Model
摘要：
我们提出了一个包含Dine-Fischler-Srednicki-Zhitnitsky轴子手征超场的重子三重性的完全R宇称破坏超对称模型。我们参数化超对称性破缺与软条款，并确定在哪些条件下的模型是宇宙学可行的。正如预期的那样，我们总能找到一个参数空间区域，在这个区域中，轴子是冷暗物质的候选者。轴子的费米子伙伴--轴子的质量是由汤川耦合控制的。当重[ ${\mathcal O}$（TeV）]时，轴子衰变得早，不会造成宇宙学问题。当光[ $\mathcal{O}$（keV）]时，它可以是长寿的，并且是温暖的暗物质候选者。我们集中在后一种情况下，并详细研究的axino的衰变模式。我们发现，天体物理X射线和伽马射线对衰变为光子和中微子的约束可以对一些三线性超对称R宇称违反汤川耦合设置新的界限。在某些角落的参数空间的衰变的遗迹axino也可以解释一个假定的3.5千电子伏线。
英文摘要：
We propose a complete R-parity violating supersymmetric model with baryon triality that contains a Dine-Fischler-Srednicki-Zhitnitsky axion chiral superfield. We parametrize supersymmetry breaking with soft terms, and determine under which conditions the model is cosmologically viable. As expected we always find a region of parameter space in which the axion is a cold dark matter candidate. The mass of the axino, the fermionic partner of the axion, is controlled by a Yukawa coupling. When heavy [${\mathcal O}$(TeV)], the axino decays early and poses no cosmological problems. When light [$\mathcal{O}$(keV)] it can be long lived and a warm dark matter candidate. We concentrate on the latter case and study in detail the decay modes of the axino. We find that constraints from astrophysical X- and gamma rays on the decay into photon and neutrino can set new bounds on some trilinear supersymmetric R-parity violating Yukawa couplings. In some corners of the parameter space the decays of a relic axino can also explain a putative 3.5 keV line.
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