在DESI DR1 Ly$\alpha$森林中搜寻热遗迹
Hunting Thermal Relics in the DESI DR1 Ly$α$ Forest
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中文总结 AI 辅助
本研究利用DESI DR1莱曼-α森林功率谱结合CMB和BAO数据，约束额外相对论性粒子和热无菌中微子，未发现显著证据，并给出N_eff<3.41及m_s^eff<0.061 eV的严格上限。
中文摘要 AI 辅助
我们利用DESI DR1一维莱曼-$\alpha$森林功率谱，结合Planck 2018 CMB和DESI DR2 BAO测量，研究了对额外相对论性粒子和热无菌中微子的约束。我们考虑了$\Lambda$CDM+$N_{\rm eff}$扩展模型以及具有不同温度的无菌中微子（DTS）情景，在该情景中，无菌遗迹可以比标准中微子背景更冷。我们首先验证了DESI双参数$P_{\rm 1D}$压缩对DTS模型的有效性，发现未被压缩参数捕获的残余宇宙学依赖性低于0.15%。未发现额外辐射或无菌成分的显著证据。对于$\Lambda$CDM+$N_{\rm eff}$模型，我们从CMB+DESI-BAO+DESI-$P_{\rm 1D}$数据获得$N_{\rm eff}<3.41$（95%可信度）。在DTS情景中，完整的CMB+DESI-BAO+DESI-$P_{\rm 1D}$组合给出了严格的界限$m_s^{\rm eff}<0.061\\,{\rm eV}$，突显了BAO和莱曼-$\alpha$信息在约束大质量无菌丰度方面的互补性。我们进一步将允许的$\Delta N_{\rm eff}$解释为热轻遗迹，推导出它们退耦温度的下限，该下限达到QCD时期。
英文摘要
We investigate constraints on additional relativistic species and thermal sterile neutrinos using the DESI DR1 one-dimensional Lyman-$α$ forest power spectrum, combined with Planck 2018 CMB and DESI DR2 BAO measurements. We consider both the $Λ$CDM+$N_{\rm eff}$ extension and a thermal with a different-temperature sterile-neutrino (DTS) scenario, in which the sterile relic can be colder than the standard neutrino background. We first validate the DESI two-parameter $P_{\rm 1D}$ compression for the DTS model, finding that the residual cosmological dependence not captured by the compressed parameters remains below 0.15%. No significant evidence for additional radiation or a sterile component is found. For $Λ$CDM+$N_{\rm eff}$, we obtain $N_{\rm eff}<3.41$ at 95% credibility from CMB+DESI-BAO+DESI-$P_{\rm 1D}$. In the DTS scenario, the full CMB+DESI-BAO+DESI-$P_{\rm 1D}$ combination yields the stringent bound $m_s^{\rm eff}<0.061\,{\rm eV}$, highlighting the complementarity of BAO and Lyman-$α$ information in constraining the massive sterile abundance. We further interpret the allowed $ΔN_{\rm eff}$ in terms of thermal light relics, deriving lower limits on their decoupling temperatures that reach the QCD epoch.
发表机构
- Universidade Federal do Rio Grande do Sul（南里奥格兰德联邦大学）
- Instituto Nacional de Pesquisas Espaciais（国家空间研究所）
- University of Sheffield（谢菲尔德大学）
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