Recent work has revealed intriguing connections between a Belinsky-Khalatnikov-Lifshitz-type analysis of spacelike singularities in General Relativity and certain infinite dimensional Lie algebras, and in particular the `maximally extended' hyperbolic Kac--Moody algebra E10. In this essay we argue that these results may lead to an entirely new understanding of the (quantum) nature of space(-time) at the Planck scale, and hence -- via an effective `de-emergence' of space near a singularity -- to a novel mechanism for achieving background independence in quantum gravity.
Cosmological correlators are very important objects in cosmology as they offer us a huge amount of information of the early universe. They reside on the future boundary of a de Sitter space and can be calculated by two methods. First method involves our old Lagrangian picture where we evaluate the bulk time integrals to find the correlator at the future boundary. The other method which is our main topic of interest is to find the correlators by imposing constraints from symmetries and singularities on the future boundary. Particularly, we obtain the differential equation satisfied by the corre…
Hidden symmetries for thermodynamics and emergence of relativity
Erik Verlinde最近提出了一个关于引力的热力学起源的想法。虽然这是一个美丽的想法,可以解决引力理论中许多长期存在的问题,但它也引发了许多其他问题。在这篇文章中,我将评论Verlinde的建议,特别强调相对性原理的物理起源的一些问题。我们发现,存在着一个包含时空的庞加莱群的热力学隐对称性的大群,在庞加莱群中空间是突现的。这就解释了相对性原理的热力学起源。
We propose a CFT definition of local observables in both the exterior and interior of bulk black holes, whenever such an interior exists. We achieve this by introducing a small microcanonical black hole as a "probe" and using its modular flow to propagate operators from the asymptotic boundary to the interior of other black holes along its worldline, elaborating on the ideas of [2009.04476]. The key conceptual advance is a CFT criterion for selecting states whose modular flow acts as geometric proper time translation in the bulk, which we dub "local equilibrium" states. Our interior reconstruc…
Gauge symmetries remove unphysical states and guarantee that field theories are free from the pathologies associated with these states. In this work we find a set of general conditions that guarantee the removal of unphysical states in field theories describing interacting vector fields. These conditions are obtained through the extension of a mechanism for the emergence of gauge symmetries proposed in a previous article [C. Barceló et al. JHEP 10 (2016) 084] in order to account for non-Abelian gauge symmetries, and are the following: low-energy Lorentz invariance, emergence of massless vector…
Baryonic symmetries and M5 branes in the AdS_4/CFT_3 correspondence
本文研究了M2膜在Calabi-Yau四重奇点上AdS_4/CFT_3对应中与Betti多重态对偶的U(1)对称性。AdS_4中矢量场的边界条件的分析允许在这样的对称性下可以考虑携带非零电荷的包裹M5膜态的选择。我们首先集中在孤立的环面奇点没有消失的六个循环,并详细研究了锥上Q^{111}。所考虑的边界条件与规范群为U(1)^2 x SU(N)^4的CFT是对偶的。我们发现该理论中规范不变重子型算子的谱与包裹的M5膜态的谱之间存在一致性。此外,这些对称性自发破缺的真空物理学与涉及奇点解析的对偶引力分析精确匹配,在那里我们能够匹配重子算子、戈德斯通玻色子和全局弦的凝聚。我们还认为,更一般的理论,其中的决议有六个周期,预计收到非微扰修正M5膜瞬子。我们给出了一个将瞬子作用量与可归一化的调和二形式联系起来的一般公式,并对Q^{222}的例子进行了显式计算。这种瞬子的全息解释目前还不清楚。
Positivity and Cluster Structures in Landau Analysis
Max Planck Institute for Mathematics in the Sciences(马克斯·普朗克科学促进研究所数学研究所);Max Planck Institute for Physics(马克斯·普朗克物理研究所);Okinawa Institute of Science and Technology(冲绳科学技术大学院大学)
We report on recent developments regarding the supersymmetric Free Differential Algebra describing the vacuum structure of $D=11$ supergravity. We focus on the emergence of a hidden superalgebra underlying the theory, explaining the group-theoretical role played by the nilpotent fermionic generator naturally appearing for consistency of the construction. We also discuss the relation between this hidden superalgebra and other superalgebras of particular relevance in the context of supergravity and superstring, involving a fermionic generator with 32 components.