arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0905.2798hep-thgr-qc
收藏

无洛伦兹不变性的量子引力

Quantum gravity without Lorentz invariance

Thomas P Sotiriou, Matt Visser, Silke Weinfurtner

摘要:

在Horava的3+1维量子引力模型中有一个显著的兴趣激增,这个模型是基于在z=3 Lifshitz点的各向异性标度。Horava的模型及其变体显示了显着改善的紫外线行为,但代价是在超高动量下违反了洛伦兹不变性。在我们之前的笔记[arXiv:0904.4464 [hep-th]]的基础上,我们更详细地讨论了Horava模型的变体。与Horava的原始模型相比,我们放弃了“细致平衡“,恢复了宇称不变性。然而,我们保留Horava的“可投射性条件”,并探讨其含义。在这些条件下,我们明确展示了最一般的模型,并提取完整的经典运动方程的ADM形式。我们分析了自旋为2和自旋为0的引力子在平坦Minkowski空间中的传播。我们进一步分析了FLRW宇宙学在该模型中的经典演化,证明了高导数空间曲率项可以用来模拟辐射流体和刚性物质。最后,我们就未来前景提出一些看法。

英文摘要:

There has been a significant surge of interest in Horava's model for 3+1 dimensional quantum gravity, this model being based on anisotropic scaling at a z=3 Lifshitz point. Horava's model, and its variants, show dramatically improved ultra-violet behaviour at the cost of exhibiting violation of Lorentz invariance at ultra-high momenta. Following up on our earlier note, [arXiv:0904.4464 [hep-th]], we discuss in more detail our variant of Horava's model. In contrast to Horava's original model, we abandon "detailed balance" and restore parity invariance. We retain, however, Horava's "projectability condition" and explore its implications. Under these conditions, we explicitly exhibit the most general model, and extract the full classical equations of motion in ADM form. We analyze both spin-2 and spin-0 graviton propagators around flat Minkowski space. We furthermore analyze the classical evolution of FLRW cosmologies in this model, demonstrating that the higher-derivative spatial curvature terms can be used to mimic radiation fluid and stiff matter. We conclude with some observations concerning future prospects.

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。

↑