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arXiv 2007.06664gr-qcastro-ph.HEhep-th
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Schwarzschild黑洞中的渐近de Sitter宇宙

Asymptotically de Sitter Universe inside a Schwarzschild black hole

Emanuele Alesci, Sina Bahrami, Daniele Pranzetti

摘要:

扩展我们以前的分析,我们研究了Schwarzschild黑洞的内部来自一个完整的圈量子引力希尔伯特空间的部分规范固定,这一次包括反体积和相干态subleading修正。我们推导出的有效哈密顿量与minisuperspace模型中引入的哈密顿量有很大不同。这种区别反映在一类均匀弹跳几何中,这些几何取代了经典奇点,并由一组与用于导出有效哈密顿量的相干态结构相关的量子参数标记。通过几何考虑固定这些量子参数,反弹后的内部几何结构揭示了对Barbero-Immirzi参数$γ$值的高灵敏度。令人惊讶的是,我们发现,$γ\approx 0.274$的结果在一个渐进的德西特几何的内部区域,现在一个宇宙学常数产生纯粹的量子引力效应。令人惊讶的是,$γ$的这个值与在圈量子引力中SU(2)黑洞熵计算得出的值完全一致。在两个完全不相关的理论框架和计算设置中出现这个值,强烈暗示了圈量子引力、黑洞物理学和可观测宇宙中的面积差距之间的深刻联系。关于后者,我们指出了一个有趣的关系之间的测量值的宇宙学常数和观察到的质量在宇宙中的自旋量子数重整化效应的建议相关联的微观动力学。

英文摘要:

Extending our previous analysis, we study the interior of a Schwarzschild black hole derived from a partial gauge fixing of the full Loop Quantum Gravity Hilbert space, this time including the inverse volume and coherent state subleading corrections. Our derived effective Hamiltonian differs crucially from the ones introduced in the minisuperspace models. This distinction is reflected in the class of homogeneous bouncing geometries that replace the classical singularity and are labeled by a set of quantum parameters associated with the structure of coherent states used to derive the effective Hamiltonian. By fixing these quantum parameters through geometrical considerations, the post-bounce interior geometry reveals a high sensitivity to the value of the Barbero-Immirzi parameter $γ$. Surprisingly, we find that $γ\approx 0.274$ results in an asymptotically de Sitter geometry in the interior region, where now a cosmological constant is generated purely from quantum gravitational effects. The striking fact is the exact coincidence of this value for $γ$ with the one derived from the SU(2) black hole entropy calculations in Loop Quantum Gravity. The emergence of this value in two entirely unrelated theoretical frameworks and computational setups is strongly suggestive of deep ties between the area gap in Loop Quantum Gravity, black hole physics, and the observable Universe. In connection to the latter, we point out an intriguing relation between the measured value of the cosmological constant and the observed mass in the Universe from a proposal for a spin quantum number renormalization effect associated to the microscopic dynamics.

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