AI 中文总结
本研究利用ISW与tSZ效应的交叉关联，联合约束原初非高斯性与早期宇宙能量注入，相关约束与Planck先验结合可降低不确定度，未来巡天将进一步提升约束精度。
AI 中文摘要
约束原初非高斯性（PNG）为宇宙暴胀物理及宇宙初始条件提供关键洞察，二者仍是宇宙学核心研究主题。本研究采用Ibitoye等人（2024）推导的积分Sachs-Wolfe（ISW）效应与热Sunyaev-Zeldovich（tSZ）效应的交叉关联，联合约束PNG及早期宇宙能量注入，包含标准星系际介质贡献。对于尺度无关的PNG，我们得到$\boldsymbol{f_{\rm NL} = -358^{+140}_{-114}}$（68%置信区间）；对于尺度依赖模型（$\boldsymbol{f_{\rm NL}=f_{\rm NL}^{0}(\ell/\ell_{0})^{n_{\rm NL}}}$，其中$\boldsymbol{\ell_{0}=200}$），我们测得$\boldsymbol{f^{0}_{\rm NL} = -296^{+173}_{-157}}$、$\boldsymbol{n_{\rm NL} = 0.62^{+1.02}_{-0.64}}$，二者均与高斯初始条件一致。我们还约束了早期宇宙能量注入幅度$\boldsymbol{\alpha_{\rm inj} = -3.93^{+1.34}_{-0.99}}$，若采用Planck 2018的$\boldsymbol{f_{\rm NL}}$约束作为先验，不确定度降低约2.6倍。未来如Simons Observatory、Euclid等巡天将进一步收紧这些约束。作为传统探测手段的补充，本研究首次通过ISW-tSZ交叉关联对外来能量注入进行约束，在探测晚时引力势与热能扰动的同时，实现早期宇宙物理的高精度检验。
英文摘要
Constraining primordial non-Gaussianity (PNG) provides key insights into the physics of cosmic inflation and the initial conditions of the Universe, which remain central topics in cosmology. In this study, we use the cross-correlation between the integrated Sachs-Wolfe (ISW) effect and the thermal Sunyaev-Zeldovich (tSZ) effect derived from Ibitoye et al. (2024) to jointly constrain PNG and early-Universe energy injection, including the standard intergalactic medium contribution. For scale-independent PNG we obtain $f_{\rm NL} = -358^{+140}_{-114}$ ($68\%$~C.L.). For a scale-dependent model ($f_{\rm NL}=f_{\rm NL}^{0}(\ell/\ell_{0})^{n_{\rm NL}}$, with $\ell_{0}=200$), we find $f^{0}_{\rm NL} = -296^{+173}_{-157}$ and $n_{\rm NL} = 0.62^{+1.02}_{-0.64}$, both consistent with Gaussian initial conditions. We also constrain the early-Universe energy injection amplitude to be $α_{\rm inj} = -3.93^{+1.34}_{-0.99}$, with uncertainty reduced by a factor of $\sim\!2.6$ if Planck 2018 $f_{\rm NL}$ constraint is applied as a prior. Future surveys such as Simons Observatory and Euclid will tighten these constraints further. Complementary to conventional probes, this work provides the first ISW-tSZ constraint on exotic energy injection and enables precision tests of early-Universe physics while probing late-time gravitational potential and thermal energy perturbations.
Comments12 pages, 2 figures
