Dark Energy and the Cosmological Constant

暗能量是推动观测到的宇宙加速的幻觉物质，暗能量的未知之一是它的组成吗？它是观测到的能量密度的真实宇宙常数，还是其他类似于演化的标量场(QuintEssence)的东西，或者是爱因斯坦广义相对论在大范围内的修正所产生的东西？最近，随着哈勃参数的局部和全球测量出现明显的紧张，这一点已经成为一个严峻的问题。一种可能的解释是，我们可以看到早期动态暗能量红移的证据，该红移与物质辐射相等和复合之间的区域有关。我们结合使用了通过动力系统分析暗能量演化的方法，以及使用遗传机器学习技术重建最佳匹配的暗能量状态方程的补充方法，我们的目标是对宇宙中暗能量的性质说一些比目前可能的更明确的事情。

One of the unknowns about dark energy, the illusive substance driving the observed acceleration of the universe, is what it is composed of? Is it a genuine cosmological constant of the observed energy density, or is it something else like an evolving scalar field (Quintessence) or something that is arising from a modification of Einstein's General theory of relativity on large scales?This has come into stark question recently with the apparent tension arising in local and global measurements of the Hubble parameter today. One possible explanation is that we could be seeing evidence of early dynamical dark energy at a redshift linked to the region between matter radiation equality and recombination. Using a combination of analytical approaches to dark energy evolution through dynamical systems, and a complementary approach using genetic machine learning techniques to reconstruct the best fitting dark energy equation of state, we aim to say something more definitive than is currently possible about the nature of dark energy in the universe.