Inflation Expels Runaways

PBH remnants as dark matter produced in thermal, matter and runaway-quintessence post-inflationary scenarios

We investigate the cosmology of mini Primordial Black Holes (PBHs) produced by large density perturbations. The mini PBHs evaporate promptly in the early universe and we assume that a stable remnant is left behind. The PBHs remnants can constitute the entire dark matter of the universe for a wide range of remnant masses. We build inflationary models, in the framework of $α$-attractors utilizing exponential functions, in which the PBHs are produced during matter, radiation and kination domination eras. The advantage of these inflationary models is that the spectral index takes values favorable …

Runaway potentials in warm inflation satisfying the swampland conjectures

The runaway potentials, which do not possess any critical points, are viable potentials which befit the recently proposed de Sitter swampland conjecture very well. In this work, we embed such potentials in the warm inflation scenario motivated by quantum field theory models generating a dissipation coefficient with a dependence cubic in the temperature. It is demonstrated that such models are able to remain in tune with the present observations and they can also satisfy all the three Swampland conjectures, namely the Swampland Distance conjecture, the de Sitter conjecture and the Transplackian…

驯服通货膨胀景观的失控问题

Taming the Runaway Problem of Inflationary Landscapes

各种各样的真空，以及它们的宇宙学实现，可能为粒子物理学和宇宙学中某些参数的明显的人择选择提供一种解释。如果各种参数的概率按体积加权，那么慢卷暴胀的平坦势也就自然地被理解了，因为势越平坦，子宇宙的体积就越大。然而，这样的暴胀景观有一个严重的问题，预测一个环境，使观察者难以指数存在，并为像我们这样的中等宇宙提供指数小概率。这个问题的一般解决方案提出，并说明在暴胀衰变和leptogenesis的背景下，导致在我们的子宇宙的再加热温度的上限。在混沌暴胀和非热稀薄发生的特定情况下，可以预测CP破坏相的大小，无中微子双β衰变的速率，在规范介导的弱尺度超对称性理论的情况下，可以预测超对称性破缺的基本尺度。

Gauge Field Production and Schwinger Reheating in Runaway Axion Inflation

In a class of (pseudoscalar) inflation, inflationary phase is followed by a kination phase, where the Universe is dominated by the kinetic energy of the inflaton that runs away in a vanishing scalar potential. In this class of postinflationary evolution of the Universe, reheating of the Universe cannot be achieved by the inflaton particle decay, which requires its coherent oscillation in a quadratic potential. In this study, we explore the U(1) gauge field production through the Chern-Simons coupling between the pseudoscalar inflaton and the gauge field during the kination era and examine the …

在一个粒子逃逸方案中违反等效原理

Violations of the equivalence principle in a dilaton-runaway scenario

我们探索了宇宙学介子固定和去耦机制的一个版本，其中低能有效作用量的介子依赖性对于裸弦耦合$g_s^2 = e^ϕ$的无限大值是极端化的。我们研究了在原始暴胀阶段，质子$ϕ$在无穷远处向其"不动点“逃逸的效率，从而近似地从物质中逃逸。剩余的介子耦合被发现是有关的膨胀过程中产生的密度波动的幅度。对于最简单的暴胀势$V (χ) = {1/2} m_χ^2 (ϕ) χ^2$，在$Δa / a \sim 10^{-12}$水平附近，剩余的介子耦合预言了对引力加速度普适性的违反.这表明，适当提高等效原理测试的精度，也许能够检测到这种失控的电子的影响。在一些关于暗子与暗物质和/或暗能量耦合的假设下，自然"常数“（特别是精细结构常数）的预期时间变化也可能足够大，可以在改进的实验或观测数据范围内。

Quintessential inflation with a trap and axionic dark matter

We study a new model of quintessential inflation which is inspired by supergravity and string theory. The model features a kinetic pole, which gives rise to the inflationary plateau, and a runaway quintessential tail. We envisage a coupling between the inflaton and the Peccei-Quinn (PQ) field which terminates the roll of the runaway inflaton and traps the latter at an enhanced symmetry point (ESP), thereby breaking the PQ symmetry. The kinetic density of the inflaton is transferred to the newly created thermal bath of the hot big bang due to the decay of PQ particles. The model successfully ac…