排除刺状WIMP暗物质使用间接搜索
Ruling Out Spiky WIMP Dark Matter using Indirect Searches
AI总结：
通过间接探测方法排除WIMP暗物质在银河系中心的尖峰结构，约束其密度剖面。
摘要：
银河系最内区域的暗物质（DM）密度分布仍是一个开放性问题。特别是，虽然银河系中心（GC）超大质量黑洞Sgr A*的绝热增长可以引起中心暗物质密度的'尖峰'，但这种尖峰的存在仍存在争议。在这里，我们使用传统的暗物质间接探测搜索方法，提出了对尖峰斜率γ_sp的新约束。我们首先将现有的光子和中微子线搜索，包括来自GC区域的贡献，转换为在存在暗物质尖峰的情况下，热平均暗物质湮灭截面⟨σv⟩的约束。然后，我们为通用的弱相互作用大质量粒子（WIMP）暗物质情景推导了尖峰剖面的新界限，其中热冻结机制将湮灭截面固定在⟨σv⟩≈（2-3）×10⁻²⁶ cm³ s⁻¹。我们发现，对于暗物质湮灭到光子的情况，费米-拉特（Fermi-LAT）和MAGIC的数据排除了GC区域的尖峰剖面，适用于从10 GeV到100 TeV的WIMP暗物质质量范围。我们的结果即使在光子通道仅构成总湮灭率的1%时仍然成立。对于中微子通道，我们利用IceCube数据来约束在O（1-10）TeV暗物质质量范围内是否存在极陡的尖峰。我们的分析可以很容易地扩展到其他湮灭通道。
英文摘要：
The dark matter (DM) density profile in the innermost region of the Galaxy remains an open question. In particular, while adiabatic growth of the supermassive black hole Sgr A$^\ast$ at the Galactic Center (GC) can induce a 'spike' in central DM density, the existence of such a spike is still under debate. Here we present new constraints on the spike slope $γ_{\rm sp}$ using conventional DM indirect detection searches. We first recast existing photon and neutrino line searches, which include the contribution from the GC region, into constraints on the thermally-averaged DM annihilation cross section $\langleσv\rangle$ in the presence of a DM spike. We then derive new bounds on the spike profile for a generic Weakly Interacting Massive Particle (WIMP) DM scenario, where the thermal freeze-out mechanism fixes the annihilation cross-section at $\langleσv\rangle\sim (2-3) \times 10^{-26}~{\rm cm}^3~{\rm s}^{-1}$. We find that, for DM annihilation to photons, existing \emph{Fermi}-LAT and MAGIC data place strong constraints on spike profiles at the GC over a broad range of WIMP DM masses, from 10 GeV to 100 TeV, for photon branching fractions down to $\sim 10^{-2}$, and remain sensitive to values as small as $\sim 10^{-4}$ in parts of the parameter space. For the neutrino channel, we use the recent IceCube data to constrain the existence of an extremely steep spike in the $\mathscr{O}(1-10)$~TeV DM mass range. Our analysis can be easily extended to other annihilation channels.
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