论文标题
Tangosidm：自我互动暗物质的诱人模型
TangoSIDM: Tantalizing models of Self-Interacting Dark Matter
论文作者
论文摘要
我们介绍了Tangosidm项目，这是一套$λ$ - 自我相互作用的暗物质（SIDM）宇宙中结构形成的宇宙学模拟套件。 Tangosidm探讨了大暗物质（DM）散射横截面对矮星系尺度的影响。由DM相互作用遵循Yukawa电位的动机，单位质量的横截面$σ/m_χ$，假定速度依赖性形式，可以避免违反大规模的当前约束。我们证明，我们的实施不仅准确地模拟了光环中的核心形成，而且还可以对重力热核心崩溃进行建模。对于宇宙学体积中的中央光环，频繁的DM粒子碰撞各向同性颗粒轨道使它们在很大程度上是球形的。我们表明，速度依赖性的$σ/m_χ$型号在卫星光环的圆速度中产生了巨大的多样性，随着横截面达到20、60和100 cm $^2 $/g的速度，速度的差异增加，$ 10^9〜 \ rm {m} _ {m} _ {m} _ {\ odot}光环内部结构的较大变化是由DM颗粒相互作用驱动的，导致某些光环的形成延伸核的形成，而在另一些halo中，则在重力热核心塌陷中。我们得出的结论是，探戈项目的SIDM模型为观察到的矮星系的密度和速度曲线多样性提供了有希望的解释。
We introduce the TangoSIDM project, a suite of cosmological simulations of structure formation in a $Λ$-Self-Interacting Dark Matter (SIDM) universe. TangoSIDM explores the impact of large dark matter (DM) scattering cross sections over dwarf galaxy scales. Motivated by DM interactions that follow a Yukawa potential, the cross section per unit mass, $σ/m_χ$, assumes a velocity dependent form that avoids violations of current constraints on large scales. We demonstrate that our implementation accurately models not only core formation in haloes, but also gravothermal core collapse. For central haloes in cosmological volumes, frequent DM particle collisions isotropise the particles orbit, making them largely spherical. We show that the velocity-dependent $σ/m_χ$ models produce a large diversity in the circular velocities of satellites haloes, with the spread in velocities increasing as the cross sections reach 20, 60 and 100 cm$^2$/g in $10^9~\rm{M}_{\odot}$ haloes. The large variation in the haloes internal structure is driven by DM particles interactions, causing in some haloes the formation of extended cores, whereas in others gravothermal core collapse. We conclude that the SIDM models from the Tango project offer a promising explanation for the diversity in the density and velocity profiles of observed dwarf galaxies.
