AI 中文总结
该研究利用DESI成像数据约束暴胀大质量场的非局域原初非高斯性，还预测了WST等第五阶段星系巡天对Δ的约束灵敏度，推导了Δ可探测性与局域PNG约束的关系。
AI 中文摘要
我们通过原初非高斯性（PNG）研究暴胀期间大质量场的宇宙学印记。当这些场足够轻时，会在星系成团中产生∝f_NL,Δ k^(Δ−2)的信号，其中Δ∈(0,3/2]，对应尺度依赖偏置的非局域PNG贡献。我们利用角关联函数，使用暗能量光谱仪（DESI）目标选择所用的成像数据约束f_NL,Δ和Δ。对于最严格的系统误差处理，未发现局域PNG的证据，因此无法约束Δ；但采用较宽松的处理时，得到f_NL^loc=27^(+10)_(-9)的 hint，与此前分析一致。对于非局域PNG，该信号偏好f_NL,Δ=5.12×10³^(+6.13)_(-3.62)、Δ=0.91^(+0.25)_(-0.19)，但该偏好在不同去污染选择下不稳健，可能由残余系统误差导致，我们将其作为未来约束的示例呈现。此外，我们预测即将到来的第五阶段巡天——宽场光谱望远镜（WST）、多目标望远镜（MUST）和第五阶段光谱实验（Spec-S5）——利用莱曼断裂星系约束Δ的灵敏度：在局域极限Δ^fid=0处，对于基准f_NL,Δ^fid=4，不同巡天的Δ不确定度σ(Δ)约为0.17-0.50；Δ的约束能力随f_NL,Δ^fid增大而提升，随基准Δ增大而下降。最后，我们推导了Δ的可探测性与局域PNG约束σ(f_NL^loc)的关系，这为估计分辨大质量场特征所需的巡天灵敏度提供了工具。
英文摘要
We investigate the cosmological imprints of massive fields during inflation through primordial non-Gaussianity (PNG). When these fields are sufficiently light, they produce a signal in galaxy clustering, $\propto f_{\rm NL,Δ}k^{Δ-2}$ with $Δ\in(0,3/2]$, corresponding to a beyond-local PNG contribution to the scale-dependent bias. We use the angular correlation function to constrain $f_{\rm NL,Δ}$ and $Δ$ using imaging data used for the targeting of the Dark Energy Spectroscopic Instrument (DESI). For the most aggressive systematics treatment, there is no evidence for local PNG, hence no constraint on $Δ$. However, when considering a less aggressive treatment, a hint is found with $f_{\rm NL}^{\rm loc}=27^{+10}_{-9}$, consistent with previous analyses. For beyond-local PNG, that signal gives a preference for $f_{\rm NL, Δ}=5.12^{+6.13}_{-3.62}\times10^{3}$ and $Δ=0.91^{+0.25}_{-0.19}$. This preference is not robust under decontamination choices, likely driven by residual systematics, and we present it as a showcase for future constraints. Additionally, we forecast the sensitivity of upcoming Stage-V surveys, the Wide-field Spectroscopic Telescope (WST), the MUltiplexed Survey Telescope (MUST), and the Spectroscopic Stage 5 Experiment (Spec-S5), to constrain $Δ$ using Lyman-break galaxies. Around the local limit, $Δ^{\rm fid}=0$, we find that they can reach uncertainties of $σ(Δ)\simeq0.17-0.50$, depending on the survey, for a fiducial $f_{\rm NL,Δ}^{\rm fid}=4$. The constraining power on $Δ$ increases as we increase $f_{\rm NL,Δ}^{\rm fid}$ and decreases for larger fiducial $Δ$. Finally, we derive a relation between the detectability of $Δ$ and the local PNG constraints, $σ(f_{\rm NL}^{\rm loc})$. This provides a tool to estimate the survey sensitivity required to resolve massive-field signatures.
Comments15 pages, 6 figures. Comments are welcome
