论文标题
关于费米尼非等热暗物质光环的稳定性
On the Stability of Fermionic Non-Isothermal Dark Matter Halos
论文作者
论文摘要
等温暗物质光环的稳定性以前已经广泛研究。在本文中，我们研究了非等温费米斯暗物质光晕的稳定性。我们表明，在存在温度梯度的情况下，由于压力引起的力具有内向和外部成分。在光晕的某些区域，提供稳定性的内力是由于压力而不是重力造成的。此外，表明较高的温度梯度导致质量和尺寸较低的光晕。我们证明，如果将温度作为自由正剖面，则可以在暗物质的质量上放置任何相位的下限。对于低变性经典结构域中的光晕，我们根据其质量密度来得出其温度的分析表达，并通过要求温度不是负阴性，将上限放在暗物质的质量上。然后，我们将Burkert质量剖面用于银河系，以表明，如果光环的中心温度是几个开kin，则暗物质的质量不能超过几个kev。
The stability of isothermal dark matter halos has been widely studied before. In this paper, we investigate the stability of non-isothermal fermionic dark matter halos. We show that in the presence of temperature gradient, the force due to the pressure has both inward and outward components. In some regions of halos, the inward force that provides stability is due to the pressure rather than gravity. Moreover, it is shown that higher temperature gradients lead to halos with lower mass and size. We prove that if the temperature is left as a free positive profile, one can place no phase-space lower bound on the mass of dark matter. For halos that are in the low degeneracy classic domain, we derive an analytic expression of their temperature in terms of their mass density and place an upper bound on the mass of dark matter by requiring that temperature is not negative. We then use the Burkert mass profile for the Milky Way to show that if the central temperature of the halo is a few Kelvins, the mass of dark matter cannot exceed a few keV.
