论文标题
通过时空热力学和手推车地平线熵的修改宇宙学
Modified cosmology through spacetime thermodynamics and Barrow horizon entropy
论文作者
论文摘要
我们介绍了使用手推车熵而不是通常的bekenstein-hawking ontropy，它提出了由“重力 - 热力学”猜想的应用而产生的经过改进的宇宙学场景。前者是由于量子钻孔的效应而对黑洞熵的修饰，通过使其具有复杂的分形结构，使黑洞层变形。我们提取了修改的宇宙方程，其中包含构成有效的黑暗能力部门的新额外术语，并且在新的Barrow指数获得其Bekenstein-Hawking值的情况下，它与通常的Friedmann方程相吻合。我们介绍了有效的暗能量密度参数演变的分析表达式，我们表明宇宙经历了通常的物质和深色能源时代。此外，黑暗能量方程式参数受巴罗变形指数的值的影响，它可能位于典型或幻影制度，或体验幻影 - 偏见交叉。最后，在渐近的大时，宇宙始终导致脱水液解决方案。
We present modified cosmological scenarios that arise from the application of the "gravity-thermodynamics" conjecture, using the Barrow entropy instead of the usual Bekenstein-Hawking one. The former is a modification of the black hole entropy due to quantum-gravitational effects that deform the black-hole horizon by giving it an intricate, fractal structure. We extract modified cosmological equations which contain new extra terms that constitute an effective dark-energy sector, and which coincide with the usual Friedmann equations in the case where the new Barrow exponent acquires its Bekenstein-Hawking value. We present analytical expressions for the evolution of the effective dark energy density parameter, and we show that the universe undergoes through the usual matter and dark-energy epochs. Additionally, the dark-energy equation-of-state parameter is affected by the value of the Barrow deformation exponent and it can lie in the quintessence or phantom regime, or experience the phantom-divide crossing. Finally, at asymptotically large times the universe always results in the de-Sitter solution.
