The Friedmann equations in deformed Hořava-Lifshitz gravity and Debye model

The Friedmann equation in modified entropy-area relation from entropy force

According to the formal holographic principle, a modification to the assumption of holographic principle in Verlinder's investigation of entropy force is obtained. A more precise relation between entropy and area in the holographic system is proposed. With the entropy corrections to the area-relation, we derivate Newton's laws and Einstein equation with a static spherically symmetric holographic screen. Furthermore we derived the correction terms to the modified Friedmann equation of the FRW universe starting from the holographic principle and the Debye model.

宇称偶二次度量-仿射引力的完整背景宇宙学

Complete background cosmology of parity-even quadratic metric-affine gravity

本文研究了曲率、挠率和非度规二次型度量-仿射引力的宇宙学，导出修正的Friedmann方程并发现两个特殊分支，同时提供了适用于SymPy等平台的完整方程组。

A phase space description of the FLRW quantum cosmology in Ho$\check{\rm r}$ava-Lifshitz type gravity

Quantum cosmology of the Friedmann-Lemaître-Robertson-Walker model with cosmological constant in the Ho$\check{\rm r}$ava-Lifshitz type gravity is studied in the phase space by means of the Wigner function. The modification of the usual general relativity description by the Ho$\check{\rm r}$ava-Lifshitz type gravity induces a new scenario for the origin of the Universe with an embryonic era where the Universe can exist classically before the tunneling process takes place and which gives rise to the current evolution of the Universe. The Wigner functions corresponding to the Hartle-Hawking, Vil…

大爆炸核合成对具有Weyl边界宇宙的宇宙演化的约束

Big Bang Nucleosynthesis constraints on the cosmological evolution in a Universe with a Weylian Boundary

本文研究了Weyl边界项对大爆炸核合成中宇宙演化的影响，通过构建三种不同的宇宙模型，利用大爆炸数据对模型进行约束，分析了边界对轻元素丰度的影响。

The Spatial Averaging Limit of Covariant Macroscopic Gravity - Scalar Corrections to the Cosmological Equations

It is known that any explicit averaging scheme of the type essential for describing the large scale behaviour of the Universe, must necessarily yield corrections to the Einstein equations applied in the Cosmological setting. The question of whether or not the resulting corrections to the Einstein equations are significant, is still a subject of debate, partly due to possible ambiguities in the averaging schemes available. In particular, it has been argued in the literature that the effects of averaging could be gauge artifacts. We apply the formalism of Zalaletdinov's Macroscopic Gravity (MG) …