标题： f(Q,T)引力中的恒定滚动和原初黑洞 显示英文标题

标题： Constant-roll and primordial black holes in f(Q,T) gravity

摘要： 在这项研究中，我们探讨了恒定滚动条件的后果，并检验了$f(Q,T)$引力在宇宙膨胀过程中的作用。 我们通过计算修正的 Friedmann 方程并给出一种替代技术来分析膨胀场景，该技术能够将修正的慢滚参数与恒定滚动参数$\beta $联系起来。 考虑混沌和丘陵顶两种模型，我们计算了光谱指数和张量-标量比，并比较它们与普朗克数据的兼容性，对于不同的恒定滚动参数$\beta $选择。 我们研究了原始黑洞在所选修正引力模型中的演化，同时考虑了吸积过程和由于霍金辐射引起的蒸发。 我们计算了蒸发和吸积的质量率，并提供了原始黑洞质量和$f(Q,T)$引力模型中辐射的解析估计。 显示英文摘要

摘要： In this study, we investigate the consequence of the constant-roll condition and examine the role of $f(Q,T)$ gravity in the cosmological inflation process. We analyze the inflationary scenario by calculating modified Friedmann equations, and giving an alternative technique that enables relating modified slow-roll parameters to the constant roll parameter $\beta $. Considering both chaotic and hilltop models, we calculate the spectral index and the tensor-to-scalar ratio and compare their compatibility with Planck's data for different choices of the constant roll parameter $\beta $. We examine the evolution of primordial black holes in our chosen modified gravity model taking into account the accretion process and the evaporation due to Hawking radiation. We compute the evaporation and accretion masses rate and provide an analytic estimation of the primordial black holes masse and of the radiation in the $f(Q,T)$ gravity model.