Resolution of Singularities in Quantum Gravity and Quantum Cosmology.

量子引力和量子宇宙学中奇点的解决。

• 批准号: 2153880
• 金额: --
• 依托单位: University of Nottingham
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2018
• 资助国家: 英国
• 起止时间: 2018 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2153880
• 关键词: Resolution; Singularities; Quantum; Gravity; Cosmology.

Singularities arise in the context of general relativity like in black holes and at the Big Bang. They signal a breakdown of classical general relativity and the need for a quantum theory of gravity in order to obtain a more complete understanding. A lot of work for understanding these singularities has been done in simplified models (minisuperspace models) but it is far from clear whether these capture the relevant physics of full quantum gravity as such models often depend on additional ad-hoc assumptions whose fundamental justification is unclear. The goal of my PhD is to develop a more systematic and rigorous derivation of effective symmetry-reduced quantum cosmology models from proposed theories of quantum gravity such as group field theory (GFT) and loop quantum gravity (LQG). In particular the idea that a macroscopic universe is obtained from a "condensate" of a large number of interacting degrees of freedom of quantum geometry will be employed.

奇点出现在广义相对论的背景下，例如黑洞和大爆炸。它们标志着经典广义相对论的崩溃以及需要量子引力理论才能获得更完整的理解。理解这些奇点的大量工作都是在简化模型（微型超空间模型）中完成的，但尚不清楚这些模型是否捕获了全量子引力的相关物理现象，因为此类模型通常依赖于额外的临时假设，其基本理由尚不清楚。我攻读博士学位的目标是从群场论 (GFT) 和圈量子引力 (LQG) 等量子引力理论中，更系统、更严格地推导有效的对称性约简量子宇宙学模型。特别是，将采用宏观宇宙是从大量相互作用的量子几何自由度的“凝聚体”中获得的想法。

项目成果

Singularity resolution depends on the clock

奇点分辨率取决于时钟

• DOI: http://dx.10.1088/1361-6382/abb14f
• 发表时间: 2020
• 期刊: Classical and Quantum Gravity
• 影响因子: 3.5
• 作者: Gielen S