论文标题
palatini $ r^2 $典型的通货膨胀
Palatini $R^2$ Quintessential Inflation
论文作者
论文摘要
我们在Palatini $ r^2 $重力中构建了一种典型通货膨胀的模型，该模型使用具有简单指数潜力的标量场，并与运行的非微耦合与重力耦合。在早期，该领域充当充气，而后来在其上成为当前的黑暗能量。将标量扇区与理想的流体相结合，我们研究了该模型从通货膨胀一直到深色能量统治的宇宙学演变。我们解释了爱因斯坦框架中的结果，在液体和田间之间出现了耦合，在以物质为主时代的时代将能量从前者流到后者。我们在参数空间上执行数值扫描，并找到与通货膨胀CMB数据和晚期行为的观测值保持一致的点。最终的暗能量密度来自模型参数之间的相互作用，而无需在$λ$ CDM中对宇宙常数进行极端微调。
We construct a model of quintessential inflation in Palatini $R^2$ gravity employing a scalar field with a simple exponential potential and coupled to gravity with a running non-minimal coupling. At early times, the field acts as the inflaton, while later on it becomes the current dark energy. Combining the scalar sector with an ideal fluid, we study the cosmological evolution of the model from inflation all the way to dark energy domination. We interpret the results in the Einstein frame, where a coupling emerges between the fluid and the field, feeding energy from the former to the latter during the matter-dominated era. We perform a numerical scan over the parameter space and find points that align with observations for both the inflationary CMB data and the late-time behaviour. The final dark energy density emerges from an interplay between the model parameters, without requiring the extreme fine-tuning of the cosmological constant in $Λ$CDM.
