耦合标量场对结构形成的影响
On the Effects of Coupled Scalar Fields on Structure Formation
摘要：
标量场（代表暗能量）与暗物质之间的耦合可以产生丰富的宇宙学现象。它主要通过第五种力来影响宇宙结构的形成，第五种力是一种与速度相关的力，它平行于粒子的运动方向并与其速度成比例，有效地重新调整粒子质量，以及修改背景膨胀率。在许多情况下，这些影响相互纠缠，很难看出哪一个是主要的。在这里，我们进行N体模拟研究其定性行为和相对重要性，影响关键结构形成可观的，指数标量场耦合模型。我们发现，第五种力，标量耦合效应的一个突出例子，远不如粒子质量的重新标度或修改的膨胀率重要。特别是，粒子质量的重新缩放被证明是导致比在LCDM，这也是在以前的独立耦合标量场模拟中观察到的模式，在晕中的粒子浓度较低的关键因素。
英文摘要：
A coupling between a scalar field (representing the dark energy) and dark matter could produce rich phenomena in cosmology. It affects cosmic structure formation mainly through the fifth force, a velocity-dependent force that acts parallel to particle's direction of motion and proportional to its speed, an effective rescaling of the particle masses, and a modified background expansion rate. In many cases these effects entangle and it is difficult to see which is the dominant one. Here we perform N-body simulations to study their qualitative behaviour and relative importance in affecting the key structure formation observables, for a model with exponential scalar field coupling. We find that the fifth force, a prominent example of the scalar-coupling effects, is far less important than the rescaling of particle mass or the modified expansion rate. In particular, the rescaling of particle masses is shown to be the key factor leading to less concentration of particles in halos than in LCDM, a pattern which is also observed in previous independent coupled scalar field simulations.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
