论文标题
$τ_\ mathrm {nl} $从普朗克温度和极化上的约束
Constraints on $τ_\mathrm{NL}$ from Planck temperature and polarization
论文作者
论文摘要
我们使用最终的Planck任务温度和极化数据来更新有关原始三光谱幅度的限制。在挤压的极限中，将观察到宇宙学的局部三角光谱是CMB天空上小规模功率的空间调制。我们通过二次估计器技术重建该信号作为统计各向异性的来源。我们系统地演示了如何通过可能方法将重建的调制字段的估计功率谱转化为对$τ_\ Mathrm {nl} $的约束，从模拟中推断出已知的$τ_\ mathrm {nl} $信号（从模拟中）来证明过程有效性。我们的基线结果限制了$τ_\ Mathrm {nl} <1700 $在95 \％置信度下，提供了迄今为止最严格的约束。
We update constraints on the amplitude of the primordial trispectrum, using the final Planck mission temperature and polarization data. In the squeezed limit, a cosmological local trispectrum would be observed as a spatial modulation of small-scale power on the CMB sky. We reconstruct this signal as a source of statistical anisotropy via quadratic estimator techniques. We systematically demonstrate how the estimated power spectrum of a reconstructed modulation field can be translated into a constraint on $τ_\mathrm{NL}$ via likelihood methods, demonstrating the procedures effectiveness by inferring known $τ_\mathrm{NL}$ signal(s) from simulations. Our baseline results constrain $τ_\mathrm{NL} < 1700$ at the 95\% confidence level, providing the most stringent constraints to date.
