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arXiv 2102.01866hep-thgr-qc
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$(d+D)$维各向异性共形引力的若干问题

Aspects of $(d+D)$-dimensional Anisotropic Conformal Gravity

Jae-Hyuk Oh, Phillial Oh

摘要:

我们讨论了各向异性引力在$(d+D)$维时空中的各个方面,其中$D$维被视为额外的维度。它是基于叶理保持同形不变性和各向异性共形不变性。通过引入因子$z$和Weyl标量场来体现各向异性,因子$z$区分额外$D$维相对于$d$维基时空的标度,Weyl标量场介导各向异性标度对称性.没有内在的尺度,但物理尺度$M_*$作为自发共形对称破缺的结果出现。一些真空的解决方案,我们得到了讨论的基础时空和额外的维度之间的“大小分离”的问题。尺度的分离意味着基本时空和额外维度中尺度之间的大等级。我们还讨论了有趣的理论从我们的模型。在(4,1)的情况下,我们提出了一个层次问题的解决方案,并讨论了与膜世界模型结果的比较。在$(d,D)=(2,2)$情形下,我们提出了一个UV-完全么正量子引力,它可能成为IR中的Einstein引力.在一定的(2,1)情形下,我们得到了CGHS-模型.

英文摘要:

We discuss various aspects of anisotropic gravity in $(d+D)$-dimensional spacetime where $D$ dimensions are treated as extra dimensions. It is based on the foliation preserving diffeomorphism invariance and anisotropic conformal invariance. The anisotropy is embodied by introducing a factor $z$ which discriminates the scaling degree of the extra $D$ dimensions against the $d$-dimensional base spacetime and Weyl scalar field which mediates the anisotropic scaling symmetry. There is no intrinsic scale but a physical scale $M_*$ emerges as a consequence of spontaneous conformal symmetry breaking. Some vacuum solutions are obtained and we discuss an issue of `size separation' between the base spacetime and the extra dimensions. The size separation means large hierarchy between the scales appearing in the base spacetime and the extra dimensions respectively. We also discuss interesting theories obtained from our model. In the case of (4,1), we propose a resolution of hierarchy problem and discuss comparison with the results of the brane-world model. In a $(d,D)=(2,2)$ case, we suggest a UV-complete unitary quantum gravity which might become Einstein gravity in IR. In a certain (2,1) case, we obtain CGHS-model.

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。

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