论文标题

热化,碎片和潮汐破坏:暗物质超流体的复杂银河系动力学

Thermalization, Fragmentation and Tidal Disruption: The Complex Galactic Dynamics of Dark Matter Superfluidity

论文作者

Berezhiani, Lasha, Cintia, Giordano, Khoury, Justin

论文摘要

重新审视了能够表现出超级流体的自我相互作用的玻色粒暗物质的想法。我们表明,该理论最有趣的参数空间对应于完全热热的暗物质光环。结果,由于高变性,整个光环都经历了玻色 - 因斯坦凝结。由于观察到的是,在光环郊区的暗物质密度剖面与光子郊区相似,因此我们认为牛仔裤波长必须比病毒半径短几倍。这需要在凝结后将暗物质光环片段变成超流体团块。但是,我们证明了这些可能的孤儿会遭受强烈的潮汐破坏,并表现为病毒性弱相互作用的流。一个例外是中央孤子,它的大小可能只有几十千座的大小而不会矛盾观察界。结果,在矮星系中,观察到的旋转曲线可以完全包含在超氟孤子中。在这种情况下,预计暗物质分布将对男性元密度曲线非常敏感。我们认为,矮星系观察到的旋转曲线的多样性是超流体暗物质情景的自然结果。

The idea of self-interacting bosonic dark matter capable of exhibiting superfluidity is revisited. We show that the most interesting parameter space of the theory corresponds to fully thermalized dark matter halos. As a result the entire halo undergoes Bose-Einstein condensation due to high degeneracy. Since it is observationally preferable for the dark matter density profile to be similar to cold dark matter in the outskirts of the halo, we argue that the Jeans wavelength must be at least few times shorter than the virial radius. This entails that, upon condensation, a dark matter halo fragments into superfluid clumps. However, we demonstrate that these would-be solitons experience strong tidal disruption and behave as virialized weakly interacting streams. An exception is the central soliton, which can be as large as few tens of kiloparsecs in size without contradicting observational bounds. As a result, in dwarf galaxies, the observed rotation curves can be completely contained within the superfluid soliton. In this case, the dark matter distribution is expected to be strongly sensitive to the baryonic density profile. We argue that the diversity of rotation curves observed for dwarf galaxies is a natural consequence of the superfluid dark matter scenario.

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