标量-张量宇宙学中通过降低前BBN哈勃率扩大mSUGRA参数空间
Enlarging mSUGRA parameter space by decreasing pre-BBN Hubble rate in Scalar-Tensor Cosmologies
摘要：
我们确定在什么条件下标量张量宇宙学预测的膨胀率是减少相比，标准的广义相对论的情况下。我们表明，ST理论与一个单一的物质部门通常预测增强哈勃率在过去，作为一个有吸引力的固定点的要求，在晚些时候对广义相对论的结果。相反，当添加具有不同共形因子的额外物质扇区时，保持到广义相对论的后期收敛，同时可以驱动过去的减小的膨胀率。对于适当选择的参数，支配的标量场的演变，一个相当大的减少（约2个数量级）的哈勃率之前，大爆炸核合成可以获得。然后，我们讨论了这些宇宙学模型的遗迹丰度的暗物质是最小的超引力模型的影响：我们表明，宇宙学允许的区域在参数空间显着扩大，这意味着在LHC上的中性伴子现象的潜在范围的变化。
英文摘要：
We determine under what conditions Scalar Tensor cosmologies predict an expansion rate which is reduced as compared to the standard General Relativity case. We show that ST theories with a single matter sector typically predict an enchanced Hubble rate in the past, as a consequence of the requirement of an attractive fixed point towards General Relativity at late times. Instead, when additional matter sectors with different conformal factors are added, the late time convergence to General Relativity is mantained and at the same time a reduced expansion rate in the past can be driven. For suitable choices of the parameters which govern the scalar field evolution, a sizeable reduction (up to about 2 orders of magnitude) of the Hubble rate prior to Big Bang Nucleosynthesis can be obtained. We then discuss the impact of these cosmological models on the relic abundance of dark matter is minimal Supergravity models: we show that the cosmologically allowed regions in parameter space are significantly enlarged, implying a change in the potential reach of LHC on the neutralino phenomenology.
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