arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0905.4116hep-th
收藏

Brans-Dicke宇宙学中扩展的$(n+1)$ -维虫洞解

Expanding $(n+1)$-Dimensional Wormhole Solutions in Brans-Dicke Cosmology

E. Ebrahimi, N. Riazi

摘要:

利用Brans-Dicke引力理论中的无痕能量动量张量,我们得到了两类$(n+1)$维虫洞解.第一类包含虫洞解决方案在一个开放的几何形状,而第二个包含虫洞解决方案在开放和封闭的宇宙。除了虫洞的几何形状,裸奇点和最大对称时空也出现在解决方案中的特殊情况。我们还考虑了虫洞的解决方案的travesibility,并已表明,他们确实是可移植的。最后,我们讨论了支持这种几何的能量-动量张量,并检查了能量条件。我们发现第一类解中的虫洞解违反了弱能量条件(WEC)。在第二类中,封闭宇宙中的虫洞几何确实违反WEC,但在开放宇宙中,通过适当选择常数,支持物质的能量动量张量可以满足WEC。然而,即使在这种情况下,包括标量场和物质能量动量张量的全部有效能量动量张量仍然违反WEC。

英文摘要:

We have obtained two classes of $(n+1)$-dimensional wormhole solutions using a traceless energy-momentum tensor in Brans-Dicke theory of gravity. The first class contains wormhole solutions in an open geometry while the second contains wormhole solutions in both open and closed universes. In addition to wormhole geometries, naked singularities and maximally symmetric spacetime also appear among the solutions as special cases. We have also considered the travesibility of the wormhole solutions and have shown that they are indeed traverseable. Finally, we have discussed the energy-momentum tensor which supports this geometry and have checked for the energy conditions. We have found that wormhole solutions in the first class of solutions violate weak energy condition (WEC). In the second class, the wormhole geometries in a closed universe do violate WEC, but in an open universe with suitable choice of constants the supporting matter energy-momentum tensor can satisfy WEC. However, even in this case the full effective energy-momentum tensor including the scalar field and the matter energy-momentum tensor still violates the WEC.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑