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arXiv 0806.2041hep-thgr-qc
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Maxwell-Dilaton背景下的动态畴壁

Dynamic domain walls in Maxwell-Dilaton background

Debaprasad Maity

摘要:

受量子引力下$n$维背景时空的Chamblin-Reall解和相同背景下畴壁动力学的启发,我们试图通过引入体电磁场来推广这些解.假设电磁场与标量场以指数方式耦合。根据模型中各参数之间的特定关系,我们找到了五种不同类型的解。对于每一种情况,解都有奇异性。在这样的背景下,我们也研究了畴壁的动力学。能量密度,发挥这些有趣的动力学的作用,是已知的诱导体场通过以色列结条件。在这个更一般的背景场组态中,我们再次发现了许多与动态畴壁相一致的静态体时空的存在。在几种情况下,取决于参数的值,在演化的早期阶段,畴壁被发现有一个通货膨胀阶段的有限期间,它的适当的时间,其次是通常的减速膨胀。

英文摘要:

Motivated by the well know Chamblin-Reall solutions of $n$-dimensional background spacetime in a dilaton gravity and the dynamics of a domain wall in the same backgrounds, we have tried to generalize those solutions by including electromagnetic field in the bulk. The electromagnetic field is assumed to be coupled with the scalar field in an exponential way. Under the specific relations among the various parameters in our model, we have found five different types of solutions. For every case, the solution has singularity. In these backgrounds, we have also studied the dynamics of domain wall. The energy densities which play the role of these interesting dynamics, are know to be induced from the bulk fields through Israel junction condition. In this more general background field configuration, we have again found many occasions to exist static bulk spactime consistent with the dynamic domain wall. In several cases, depending upon the values of the parameters, in the early stage of evolution, the domain wall is found to have an inflationary phase for finite period of it's proper time followed by usual decelerated expansion.

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