Systems of dense spheres interacting through very short-ranged attraction are known from theory, simulations and colloidal experiments to exhibit dynamical reentrance. Their liquid state can thus be fluidized at higher densities than possible in systems with pure repulsion or with long-ranged attraction. A recent mean-field, infinite-dimensional calculation predicts that the dynamical arrest of the fluid can be further delayed by adding a longer-ranged repulsive contribution to the short-ranged attraction. We examine this proposal by performing extensive numerical simulations in a three-dimensional system. We first find the short-ranged attraction parameters necessary to achieve the densest liquid state, and then explore the parameter space for an additional longer-ranged repulsion that could further enhance reentrance. In the family of systems studied, no significant (within numerical accuracy) delay of the dynamical arrest is observed beyond what is already achieved by the short-ranged attraction. Possible explanations are discussed.

中文翻译：

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使用竞争性相互作用推迟动态过渡密度

从理论，模拟和胶体实验可知，通过非常短距离的吸引力相互作用的致密球体系统表现出动态折返。因此，与具有纯排斥力或远距离吸引力的系统相比，它们的液态可以更高的密度流化。最近的平均场无限维计算预测，通过向短距离引力添加更长距离的排斥作用，可以进一步延迟流体的动态阻滞。我们通过在三维系统中执行广泛的数值模拟来研究该建议。我们首先找到实现最稠密液体状态所必需的短程吸引参数，然后探索额外的长程排斥力的参数空间，这可以进一步增强进入性。在所研究的系统系列中，没有观察到动态制动的明显延迟（在数值精度范围内），超出了短程吸引力已经实现的延迟。