论文标题

非本地重力宇宙学的相空间视图

The phase-space view of non-local gravity cosmology

论文作者

Capozziello, Salvatore, D'Agostino, Rocco, Luongo, Orlando

论文摘要

我们认为在同质和各向同性宇宙背景下的非本地重点重力理论是推动宇宙历史的一种情况。特别是,我们研究了包含RICCI标量反向的重力作用的宇宙学特性,该作用是提议在高和低能状态下改善爱因斯坦重力的提议。特别是,通过将宇宙学方程重新铸造为具有无尺寸变量的一阶微分方程的自主系统,可以详细分析具有物理动机的非本地指数耦合的动力学。因此,我们研究了相位空间域及其临界点,研究了它们的稳定性和主要特性。特别是,根据模型的自由参数讨论了马鞍点和延迟宇宙学吸引子。最后,我们讨论了鉴于暗能量行为和$λ$ CDM模型,我们的方法的主要物理后果。

We consider non-local Integral Kernel Theories of Gravity in a homogeneous and isotropic universe background as a possible scenario to drive the cosmic history. In particular, we investigate the cosmological properties of a gravitational action containing the inverse d'Alembert operator of the Ricci scalar proposed to improve Einstein's gravity at both high and low-energy regimes. In particular, the dynamics of a physically motivated non-local exponential coupling is analyzed in detail by recasting the cosmological equations as an autonomous system of first-order differential equations with dimensionless variables. Consequently, we study the phase-space domain and its critical points, investigating their stability and main properties. In particular, saddle points and late-time cosmological attractors are discussed in terms of the free parameters of the model. Finally, we discuss the main physical consequences of our approach in view of dark energy behavior and the $Λ$CDM model.

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