论文标题
晚期暗物质振荡和Core-CUSP问题
Late-Time Dark Matter Oscillations and the Core-Cusp Problem
论文作者
论文摘要
核心问题问题仍然是$λ$ CDM宇宙学的预测与矮球和其他星系中暗物质（DM）概况的预测之间的尚未解决的张力。我们提出了一种新的场景，用于通过晚期星系中的DM歼灭的重新激活将尖齿转换为核心。当不对称的DM模型中，违反质量术语很小，会导致DM与其反粒子之间的振荡，这可能会发生在不对称的DM模型中。使用分析方法以及重力N体模拟，我们表明该机制可以强符合质量$M_χ\ sim（0.1-1）$ GEV的光质量DM的银河系DM轮廓，并在其中DM可以灭绝DM。我们确定参数空间的区域，其中DM颗粒的an灭比降低DM轮廓的内密度时的弹性散射更有效。因此，暗物质歼灭是质量上不同的替代方法，它是解决尖峰核问题的弹性自我相互作用的机制。
The core-cusp problem persists as an unresolved tension between the predictions of $Λ$CDM cosmology and observations of dark matter (DM) profiles in dwarf spheroidal and other galaxies. We present a novel scenario for converting cusps into cores through reactivation of DM annihilation in galaxies at late times. This can happen in asymmetric DM models when there is a very small DM-number violating mass term that causes oscillations between DM and its antiparticle. Using analytic methods as well as gravitational N-body simulations, we show that this mechanism can robustly eliminate cusps from galactic DM profiles for light fermionic DM of mass $m_χ\sim (0.1-1)$ GeV and a lighter mediator into which the DM can annihilate. We identify regions of parameter space where annihilation of DM particles is more efficient than elastic scattering at reducing the inner density of the DM profile. Dark matter annihilation is therefore a qualitatively distinct alternative to the mechanism of elastic self-interacting dark matter for addressing the cusp-core problem.
