弦状时空泡沫、类芬斯勒物质和暗物质遗迹
Stringy Space-Time Foam, Finsler-like Metrics and Dark Matter Relics
摘要：
我们讨论了在D粒子时空泡沫背景下的弦宇宙学中热暗物质（DM）遗迹丰度的变化。由于大质量DM与泡沫中的D粒子缺陷的相互作用，在背景时空上的反反应导致时空度规中的量子涨落。我们证明，这些导致存在额外的源项的玻尔兹曼方程用于确定热暗物质遗迹丰度。源项由诱导度规变形的具体形式决定;后者取决于DM粒子在与D粒子缺陷相互作用期间的动量转移，因此类似于芬斯勒度规。在大额外维引起的低弦标度的情况下，我们的结果可能对寻找可行的超对称模型具有唯象意义。
英文摘要：
We discuss modifications of the thermal Dark Matter (DM) relic abundances in stringy cosmologies with D-particle space-time foamy backgrounds. As a result of back-reaction of massive DM on the background space-time, owing to its interaction with D-particle defects in the foam, quantum fluctuations are induced in the space-time metric. We demonstrate that these lead to the presence of extra source terms in the Boltzmann equation used to determine the thermal dark matter relic abundances. The source terms are determined by the specific form of the induced metric deformations; the latter depend on the momentum transfer of the DM particle during its interactions with the D-particle defects and so are akin to Finsler metrics. In the case of low string scales arising from large extra dimensions our results may have phenomenological implications for the search of viable supersymmetric models.
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