玻色-爱因斯坦凝聚体暗物质的功率谱
Power spectrum for the Bose-Einstein condensate dark matter
摘要：
我们假设暗物质是由标量粒子组成的，这些标量粒子在宇宙演化的某个时刻形成了玻色-爱因斯坦凝聚体（BEC）。之后，冷的暗物质以冷凝物的形式存在，其行为与标准的暗物质成分略有不同。本文研究了BEC暗物质与重子物质和宇宙学常数共存的大尺度微扰动力学。微扰动力学的研究使用新牛顿宇宙学（其中的压力是动态相关的均匀和各向同性的背景），这是假设是正确的小值的声速。我们表明，BEC暗物质的影响，可以看到在物质的功率谱，如果凝聚粒子的质量是在15 meV < m <700 meV的范围内导致一个小的，但可察觉的，在大尺度的功率过剩。
英文摘要：
We assume that dark matter is composed of scalar particles that form a Bose-Einstein condensate (BEC) at some point during the cosmic evolution. Afterwards, cold dark matter is in the form of a condensate and behaves slightly different from the standard dark matter component. We study the large scale perturbative dynamics of the BEC dark matter in a model where this component coexists with baryonic matter and cosmological constant. The perturbative dynamics is studied using neo- Newtonian cosmology (where the pressure is dynamically relevant for the homogeneous and isotropic background) which is assumed to be correct for small values of the sound speed. We show that BEC dark matter effects can be seen in the matter power spectrum if the mass of the condensate particle lies in the range 15meV < m < 700meV leading to a small, but perceptible, excess of power at large scales.
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