论文标题
具有高阶曲率项的改性重力中弹跳宇宙学
Bouncing cosmology in modified gravity with higher-order curvature terms
论文作者
论文摘要
通过使用重建技术对较高的重力理论的幂律参数化来探索平坦均质和各向同性宇宙的弹跳场景，并具有高阶曲率和能量摩托张量的轨迹。证明弹跳标准是满足的，因此可以避免宇宙学初始性。另外，结果表明，状态参数的方程越过幻影划分的线。在当前情况下，宇宙在弹跳点周围充满了完美的液体，在这种情况下，宇宙变得高度不稳定，可以实现大反弹。此外，发现极端加速发生在弹跳点。
A bouncing scenario of a flat homogeneous and isotropic universe is explored by using the reconstruction technique for the power-law parametrization of the Hubble parameter in a modified gravity theory with higher-order curvature and trace of the energy-momentum tensor terms. It is demonstrated that bouncing criteria are satisfied so that the cosmological initial singularity can be avoided. In addition, it is shown that the equation of state parameter crosses the line of the phantom divide. In the present scenario, the universe is filled with perfect fluid around the bouncing point, in which the universe becomes highly unstable and a big bounce can be realized. Furthermore, it is found that extremal acceleration occurs at the bouncing point.
