标题： 加热和粒子在单模f(R, T)引力中的产生 显示英文标题

标题： Reheating and particle creation in unimodular f(R, T) gravity

摘要： 我们研究了在单模f(R,T)引力中的宇宙暴胀和再加热过程。 在再加热时期，这发生在暴胀结束之后，暴胀场的能量密度通过例如在势能最小值附近的快速振荡转化为辐射能量。 我们通过计算再加热温度来量化我们的研究。 这个量用谱指数和功率谱来表示，这为约束模型的参数空间提供了合适的框架。 我们在单模f(R, T)引力的背景下，讨论了平坦、均匀和各向同性宇宙中无质量粒子的产生。 我们得到了单位体积空间中产生的粒子数量。 为了避免场方程的复杂性，我们进行共形变换到爱因斯坦框架，并通过考虑一些具体的示例来研究再加热。 此外，我们除了得到一些数值估计外，还获得了相应的解析解。 显示英文摘要

摘要： We study cosmological inflation and reheating in the unimodular f(R,T) gravity. During the reheating era, which takes place just after the end of inflation, the energy density of inflaton is converted to radiation energy through, for instance, rapid oscillation about the minimum of the potential. We quantify our investigation by calculating the reheating temperature. This quantity is written in terms of the spectral index and the power spectrum, which provides a suitable framework to constrain the parameter space of the model. We discuss the massless particle creation for a spatially flat, homogeneous and isotropic universe in the context of unimodular f(R, T) gravity. We obtain the number of created particles per unit volume of space. In order to avoid the complexity of field equations, we conformally transform in Einstein frame and investigate the reheating by considering some specific illustrative examples. Also we obtain the corresponding analytical solutions in addition to some numerical estimations.