论文标题
在达到百分比精度的道路上：反应方式
On the road to percent accuracy: The Reaction Way
论文作者
论文摘要
利用即将进行的宇宙剪切调查的前所未有的统计能力，将需要在广泛的尺度上了解物质功率谱。分析方法只能达到这种精度，最多可以达到准线性尺度。对于较小的非线性尺度，我们必须求助于$ n $ body和流体动力学模拟，尽管最近的技术进步和改进的算法在计算上仍然保持昂贵。在过去的十年中，机器学习和模拟器的出现增强了我们以令人印象深刻的计算效率达到目标准确性的能力。然而，实际上，这些技术将能够仅用于对“香草” $λ$ CDM宇宙学的扩展子的限制子集生成高精度的非线性物质功率谱。我将提出一种有希望的替代方法，以减轻这些缺点，从而从晕圈模型，扰动理论和模拟器（反应框架）中汲取强度。我将展示如何在标准宇宙学中进化的功率光谱进行调整，以占$λ$ CDM以上的物理学，并讨论对重力，深色能量参数和大量中性中性宇宙学的反应的准确性。
Taking advantage of the unprecedented statistical power of upcoming cosmic shear surveys will require exquisite knowledge of the matter power spectrum over a wide range of scales. Analytical methods can achieve such precision only up to quasi-linear scales. For smaller non-linear scales we must resort to $N$-body and hydrodynamical simulations, which despite recent technological advances and improved algorithms remain computationally expensive. Over the past decade machine learning and the advent of emulators have propelled our ability to hit the target accuracy with impressive computing efficiency. Yet, realistically these techniques will be able to produce high-precision non-linear matter power spectra only for a restricted sub-set of extensions to the "vanilla" $Λ$CDM cosmology. I will present a promising alternative to alleviate these shortcomings that draws strength from the combination of halo model, perturbation theory and emulators--the reaction framework. I will show how a power spectrum evolved in the standard cosmology can be readily adjusted to account for physics beyond $Λ$CDM, and discuss the accuracy of the reaction for well-known modifications to gravity, dark energy parametrizations and massive neutrino cosmologies.
