论文标题
带有循环量子几何效应的隧道波函数提案
Tunneling wavefunction proposal with loop quantum geometry effects
论文作者
论文摘要
在维伦金(Vilenkin)的隧道波函数提案中,我们的扩展宇宙是通过从零等级因子上的障碍物穿过障碍的隧道来诞生的。我们探讨了该提案对空间闭合的FLRW模型的可行性,其正宇宙常数包括普朗克制度中的量子重力修饰。我们的设置是对环路量子宇宙学(LQC)的有效时空描述,该描述已众所周知,它由于整体修改而替换了大爆炸奇异性。由于反弹,惠勒 - 迪维特理论的障碍潜力被类似于电位的步骤所取代,这使隧道提案不兼容。但是,对于奇异性分辨率的完整图片,必须包括量子几何形状的逆量因子修改,这在空间闭合模型中在非常小的尺度因子上起着重要作用。我们表明,通过包括逆向因子修改,最终的电位再次是障碍潜力。消失量表因子的宇宙在动态的非单位和爱因斯坦静态相似。我们表明,LQC中的量子几何效应提供了Vilenkin的隧道提案的非单一完成。我们还发现,量子几何效应会导致隧穿到量子循环宇宙中,尽管它具有由量子几何形状确定的宇宙常数的很大值。
In Vilenkin's tunneling wavefunction proposal our expanding universe is born via a tunneling through a barrier from nothing at the zero scale factor. We explore the viability of this proposal for the spatially closed FLRW model with a positive cosmological constant including quantum gravity modifications in the Planck regime. Our setting is the effective spacetime description of loop quantum cosmology (LQC) which is known to replace the big bang singularity with a bounce due to the holonomy modifications. Due to the bounce, the barrier potential of the Wheeler-DeWitt theory is replaced by a step like potential which makes the tunneling proposal incompatible. But for a complete picture of singularity resolution, inverse scale factor modifications from quantum geometry must be included which play an important role at very small scale factors in the spatially closed models. We show that with inclusion of inverse scale factor modifications the resulting potential is again a barrier potential. The universe at the vanishing scale factor is dynamically non-singular and in an Einstein static like phase. We show that quantum geometric effects in LQC provide a non-singular completion of Vilenkin's tunneling proposal. We also find that quantum geometric effects result in a possibility of a tunneling to a quantum cyclic universe albeit for a very large value of cosmological constant determined by the quantum geometry.