论文标题
通过三线性相互作用的预热产生引力波
Gravitational wave production from preheating with trilinear interactions
论文作者
论文摘要
我们研究了用单/多项式通货膨胀电位预热期间引力波（GWS）的产生，考虑到女儿场$χ$和forderton $ ϕ $之间的三连耦合$ ϕχ^2 $。对于足够大的耦合，三线性相互作用会导致$χ$颗粒的指数产生，因此，在整个过程中生成了大型随机GW背景（SGWB）。在通过所有相关阶段生产GW之后，我们研究了使用晶格模拟的预热的线性和非线性动力学。我们发现，今天的大耦合导致sgwbs的幅度很大，其顺序为$ h^2Ω_{\ rm gw}^{（0）} \ simeq 5 \ cdot10^{ - 9} $。但是，这些背景以高频为$ f _ {\ rm p} \ sim 10^6-10^8 $ Hz的峰值，这使得它们无法通过当前/计划的GW观测值进行检测。由于在任何情况下都产生的GW数量是显着的，因此我们通过对宇宙中有效数量的相对论物种的有效数量$Δn_ {\ rm eff} $使用约束来间接探测SGWB的前景。
We investigate the production of gravitational waves (GWs) during preheating with monomial/polynomial inflationary potentials, considering a trilinear coupling $ϕχ^2$ between a daughter field $χ$ and the inflaton $ϕ$. For sufficiently large couplings, the trilinear interaction leads to an exponential production of $χ$ particles, and as a result, a large stochastic GW background (SGWB) is generated throughout the process. We study the linear and non-linear dynamics of preheating with lattice simulations, following the production of GWs through all relevant stages. We find that large couplings lead to SGWBs with a large amplitude today, of the order of $h^2Ω_{\rm GW}^{(0)} \simeq 5\cdot10^{-9}$. These backgrounds are however peaked at high frequencies $f_{\rm p} \sim 10^6-10^8$ Hz, which makes them undetectable by current/planned GW observatories. As the amount of GWs produced is in any case remarkable, we discuss the prospects for probing the SGWB indirectly by using constraints on the effective number of relativistic species in the universe $ΔN_{\rm eff}$.
