International Journal of Geometric Methods in Modern Physics ( IF 2.1 ) Pub Date : 2024-04-22 , DOI: 10.1142/s0219887824501846 M. Koussour , N. Myrzakulov , Javlon Rayimbaev , Alnadhief H. A. Alfedeel , H. M. Elkhair
In this paper, we investigate the bouncing behavior of the universe within the framework of gravity, using a simple form of (where is a free model parameter) as previously studied. The model predicts a vanishing Hubble parameter in the early and late times, with the deceleration parameter approaching a specific limit at the bouncing point. The EoS parameter is observed to cross the phantom divide line () near the bouncing point, indicating a significant transition from a contracting to an expanding phase. The model satisfies the necessary energy conditions for a successful bouncing scenario, with violations indicating exotic matter near the bouncing point. Stability conditions are satisfied for certain values of near the bouncing point, but potential instabilities in late-time evolution require further investigation. Finally, we conclude that the gravity model is promising for understanding the universe’s dynamics, especially during events like the bouncing phase.
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f(R,Lm) 重力下的弹跳行为:幻影交叉和能量条件
在本文中,我们研究了宇宙在以下框架内的弹跳行为:重力,使用简单的形式(在哪里是一个自由模型参数)如之前研究的。该模型预测哈勃参数在早期和晚期消失,减速参数在弹跳点接近特定极限。观测到 EoS 参数跨越了虚拟分界线 ()在弹跳点附近,表明从收缩阶段到扩张阶段的显着转变。该模型满足成功弹跳场景所需的能量条件,违反表明弹跳点附近存在奇异物质。满足某些值的稳定性条件接近弹跳点,但后期进化中潜在的不稳定性需要进一步研究。最后,我们得出的结论是引力模型对于理解宇宙的动力学很有希望,特别是在弹跳阶段等事件期间。