论文标题
引力颗粒的产生和有效描述的有效性量子宇宙学
Gravitational Particle Production and the Validity of Effective Descriptions in Loop Quantum Cosmology
论文作者
论文摘要
LOOP量子宇宙学（LQC）的有效方法提供了用于获得LQC模型中可观察量的预测的手段。尽管在不同的情况下已广泛考虑了LQC中的有效动力学，但对扰动水平有效描述的有效性的有力证明仍然需要进一步关注。大多数方法中采用的描述的一致性需要假设测试场近似，这仅限于可以安全地忽略颗粒引力产生的颗粒重力的情况。在LQC的框架内，量化线性扰动的某些主要方法是装饰度度，混合方法和封闭/变形的代数方法。在这里，我们通过计算与背景能量密度相比，计算在重力产生的颗粒中存储的能量密度来分析测试场假设的一致性。该分析最终为我们提供了对LQC有效描述的一致性测试。
The effective approach in Loop Quantum Cosmology (LQC) has provided means to obtain predictions for observable quantities in LQC models. While an effective dynamics in LQC has been extensively considered in different scenarios, a robust demonstration of the validity of effective descriptions for the perturbative level still requires further attention. The consistency of the description adopted in most approaches requires the assumption of a test field approximation, which is limited to the cases in which the backreaction of the particles gravitationally produced can be safely neglected. Within the framework of LQC, some of the main approaches to quantize the linear perturbations are the dressed metric, the hybrid approaches and the closed/deformed algebra approach. Here, we analyze the consistency of the test field assumption in these frameworks by computing the energy density stored in the particles gravitationally produced compared to the background energy density. This analysis ultimately provides us with a consistency test of the effective descriptions of LQC.
