论文标题
在更高维度和新兴宇宙中的动力虫洞
Dynamical Wormholes in Higher Dimensions and the Emergent Universe
论文作者
论文摘要
提出了较高的虫孔，这些虫洞呈现了接收扁平的宇宙（EU）模型的。欧盟模型没有初始奇异性，具有宇宙的其他观察到的特征。欧盟模型的基本假设是，目前的宇宙从静态的爱因斯坦宇宙中出来。欧盟模型起源于动态虫洞，其喉咙是爱因斯坦静态宇宙的种子。提出了较高维平面宇宙中的一类宇宙解决方案。确定了封闭宇宙的新形状功能。状态（EOS）的非线性方程对应于三种类型的宇宙流体。 EOS参数确定宇宙流体。时空尺寸决定了特定流体的变化速率，该流体随着非交互流体的动态发展宇宙的比例因子而变化。考虑到时间$ t> t_0 $的相互作用，在三种类型的流体中，可以令人满意地描述观察到的宇宙。在较高的宇宙中，发现在喉咙无效状态（NEC）附近被侵犯，但发现远离喉咙NEC来服从于平坦情况下观察到的宇宙。欧盟模型的另一个有趣的方面是，它允许加速阶段。但是，在渐近封闭或开放式宇宙中，可以与NEC一起容纳扁平的新兴宇宙，NEC从喉咙到当前时代都可以遵守。估计虫洞喉咙的张力取决于爱因斯坦静态宇宙的初始大小和宇宙的尺寸。有趣的是，没有违反NEC来适应封闭或开放宇宙的动力虫洞。尽管在喉咙上需要外来的物质，但对于包含新兴宇宙的封闭或开放式宇宙不需要外来物质。
Dynamical wormholes in higher dimensions which admit flat emergent universe (EU) model is presented. The EU model is free from initial singularity with other observed features of the universe. The basic assumption of EU model was that the present universe emerged out from a static Einstein universe. EU model originates from a dynamical wormhole, its throat is the seed of Einstein Static universe. A class of cosmological solutions in a higher dimensional flat universe is presented. A new shape function for closed universe is determined. The non-linear equation of state (EoS) corresponds to three types of cosmic fluids. The EoS parameters determine the cosmic fluids. The space-time dimensions determines the rate of change of a particular fluid that varies with the scale factor of a dynamically evolving universe with non-interacting fluids. Considering interaction at time $t > t_0$, among the three types of fluids it is possible to describe the observed universe satisfactorily. In a higher dimensional universe it is found that near the throat null energy condition (NEC) is violated, but away from the throat NEC is found to obey admitting the observed universe for a flat case. Another interesting aspect of the EU model is that it permits late accelerating phase. However, in asymptotic closed or open universe, flat emergent universe can be accommodated with NEC which is obeyed right from the throat to the present epoch. The tension at the throat of the wormhole is estimated which is found to depend on the initial size of the Einstein static universe and dimensions of the universe. It is interesting to note that NEC is not violated to accommodate dynamical wormholes for closed or open universe. Although exotic matter is required at the throat for the flat universe, no exotic matter is required for closed or open universe which encompass the emergent universe.
