论文标题

在恒定的滚动复杂标量膨胀模型上

On the constant roll complex scalar field inflationary models

论文作者

Mohammadi, Ali, Ahmadi, Nahid, Shokri, Mehdi

论文摘要

在本文中,我们希望指出在恒定的滚动通货膨胀模型中使用复杂标量场的可能性,如观察性生存能力所需。我们以恒定的滚动速率扩展了真实场地的构想,以显示求解Einstein klein-gordon方程的可行性,这些方程受\ emph {适当}形式的恒定滚动定义的形式约束。与众所周知的(两种参数类)真实场模型相比,恒定滚动通货膨胀溶液中的灵活性更高,这是由时间的任意函数($γ(t)$)表示的。我们使用任意但恒定的功能$γ$(其中$γ= 0 $是指相应的真实场模型),并找到新的通货膨胀类别的电位。在这类模型中,实际和复杂的场模型的行为在某些方面相似,例如,具有较大恒定参数的解决方案不稳定,应将其视为早期瞬变。这些野外解决方案在很晚时在双重吸引子轨迹上放松。但是,复杂场相空间轨迹在实际场之后达到了这种稳定的状态。我们对$γ$函数空间解决方案进行了稳定分析,发现相位空间中动态稳定的轨迹在$γ$变化下是稳定的。我们通过考虑具有非规范动力学术语的恒定滚动通胀模型来扩展这项研究。通过扩大场空间的大小,我们表明多场常数滚动模型是动态的单场有效理论。如果字段空间由$ n $非规范字段参数化,则可能会有$ n $的参数可以归因于字段之间的相互作用。

In this paper we wish to point out the possibility of using a complex scalar field in a constant roll inflationary model, as needed for observational viability. We extend the idea of real field inflaton with constant rate of roll to a complex field, showing the feasibility of solving Einstein Klein-Gordon equations constrained by an \emph{appropriate} form of constant roll definition. As compared to the well known (two-parametric class of) real field models, there is one more degree of flexibility in constant roll inflationary solutions which is represented by an arbitrary function of time, $γ(t)$. We work with an arbitrary but constant function $γ$ (where $γ=0$ refers to the corresponding real field model) and find new inflationary class of potentials. In this class of models, the behavior of real and complex field models are similar in some aspects, for example the solutions with large constant roll parameter are not stable and should be considered as early time transients. These field solutions relax at late time on a dual attractor trajectory. However, complex fields phase space trajectories reach this stable regime after real fields. We performed the stability analysis on $γ$ function space solutions and found that dynamically stable trajectories in phase space are stable under $γ$ variations. We extended this study by considering multifield models of constant roll inflation with non-canonical kinetic terms. By enlarging the size of field space, we showed that a multifield constant roll model is dynamically a single field effective theory. If field space is parametrized by $N$ non-canonical fields, there will be $N$ free parameters in the potential that can be attributed to the interaction between the fields.

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