Particle production by expanding in the future light cone scalar quantum field is studied by assuming that the initial state is associated with the quasiequilibrium statistical operator corresponding to fluid dynamics. We calculate particle production from a longitudinally boost-invariant expanding quantum field designed as a simple but reliable model for the central rapidity region of a relativistic collision. Exact diagonalization of the model is performed by introducing a notion of quasiparticles.

中文翻译：

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小爆炸中的宇宙学粒子产生

通过假设初始状态与对应于流体动力学的准平衡统计算符相关联，研究了在未来光锥标量量子场中扩展的粒子产生。我们从纵向增强不变的扩展量子场计算粒子产生，该量子场设计为相对论碰撞的中心快速区域的简单但可靠的模型。通过引入准粒子的概念来执行模型的精确对角化。