论文标题
早期宇宙状态的能量分布和方程：与通货膨胀结束和辐射统治的发作相匹配
Energy distribution and equation of state of the early Universe: matching the end of inflation and the onset of radiation domination
论文作者
论文摘要
我们研究了通货膨胀结束和辐射支配结束（RD）之间宇宙状态的能量分布和方程，考虑了观察一致的单场通货膨胀场景，在大田间值下具有潜在的“平坦”，并且单一形状的形状$ v（ϕ）\ propto | p propto | ϕ | ϕ | ϕ | ϕ | ϕ | ϕ | ϕ P $。作为（p）重新加热的代理，我们包括一个二次交互$ g^2ϕ^2x^2 $之间的Efteraton $ ϕ $和一个轻标度'女儿'字段$ x $，带有$ g^2> 0 $。我们通过晶格模拟捕获了系统动力学的非扰动和非线性性质，并获得了：$ i）最终能量转移至$ x $仅取决于$ p $，而不取决于$ g^2 $，; $ ii）$以$ 2 \ leq p <4 $和订单$ \ sim 50 \％$ for $ p \ geq 4 $的订单$ \ sim $ \ sim $ \ sim $ \ sim $ \ sim p <4 $始终可以忽略不计； $ iii）$该系统在较晚的时间内以$ p = 2 $的质量分配，并且始终以$ p> 2 $的价格到达。在后一种情况下，我们计算出E折的数量，直到RD，大大降低了通货膨胀可观察到的$ N_S $和$ R $的不确定性。
We study the energy distribution and equation of state of the universe between the end of inflation and the onset of radiation domination (RD), considering observationally consistent single-field inflationary scenarios, with a potential 'flattening' at large field values, and a monomial shape $V(ϕ) \propto |ϕ|^p$ around the origin. As a proxy for (p)reheating, we include a quadratic interaction $g^2ϕ^2X^2$ between the inflaton $ϕ$ and a light scalar 'daughter' field $X$, with $g^2>0$. We capture the non-perturbative and non-linear nature of the system dynamics with lattice simulations, obtaining that: $i)$ the final energy transferred to $X$ depends only on $p$, not on $g^2$, ; $ii)$ the final transfer of energy is always negligible for $2 \leq p < 4$, and of order $\sim 50\%$ for $p \geq 4$; $iii)$ the system goes at late times to matter-domination for $p = 2$, and always to RD for $p > 2$. In the latter case we calculate the number of e-folds until RD, significantly reducing the uncertainty in the inflationary observables $n_s$ and $r$.
