In this work we consider the scalar field model with a false vacuum proposed by Avelar et al. (2008) [27]. The model depends on a parameter $s>0$. The model has unstable nontopological lump solutions with a bell shape for small s, acquiring a flat plateau around the maximum for large s. For $s\to \infty$ the ${\varphi }^4$ model is recovered. We show that for $s\gtrsim 2$ the lump is metastable with the only negative mode very close to zero. Metastable lumps can propagate and survive long enough to produce dynamical effects. Due to their simplicity, they can be an alternative to the procedure of stabilization which requires, for instance, a complex scalar field to construct nontopological solitons. We study lump-lump collisions in this model, describing the main characteristics of the scattering products at their dependence on s and the initial velocity modulus of each lump.

在这项工作中，我们考虑了 Avelar 等人提出的带有假真空的标量场模型。(2008) [27]。模型取决于参数$秒>0$. 该模型具有一个钟形的小不稳定的非拓扑疙瘩解决方案小号，围绕获取最大平坦高原大小号。为了$秒\to \infty$ 这 ${\phi }^4$模型恢复。我们证明对于$秒\gtrsim 2$团块是亚稳态的，唯一的负模式非常接近于零。亚稳态团块可以传播并存活足够长的时间以产生动力学效应。由于它们的简单性，它们可以替代稳定过程，例如需要复杂的标量场来构造非拓扑孤子。我们在这个模型中研究了块-块碰撞，描述了散射产物对s和每个块的初始速度模量的依赖的主要特征。